Tempeh
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Tempe or tempeh (; , ) is a traditional Indonesian food made from fermented
soybeans The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean. Soy is a staple crop, the world's most grown legume, and an important animal feed. Soy is a key source of f ...
. It is made by a natural culturing and controlled
fermentation Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
process that binds soybeans into a cake form. A fungus, '' Rhizopus oligosporus'' or '' Rhizopus oryzae'', is used in the fermentation process and is also known as tempeh starter. It is especially popular on the
island An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been ...
of
Java Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...
, where it is a staple source of protein. Like
tofu or bean curd is a food prepared by Coagulation (milk), coagulating soy milk and then pressing the resulting curds into solid white blocks of varying softness: ''silken'', ''soft'', ''firm'', and ''extra (or super) firm''. It originated in Chin ...
, tempeh is made from soybeans, but it is a whole-soybean product with different
nutrition Nutrition is the biochemistry, biochemical and physiology, physiological process by which an organism uses food and water to support its life. The intake of these substances provides organisms with nutrients (divided into Macronutrient, macro- ...
al characteristics and textural qualities. Tempeh's fermentation process and its retention of the whole
bean A bean is the seed of some plants in the legume family (Fabaceae) used as a vegetable for human consumption or animal feed. The seeds are often preserved through drying (a ''pulse''), but fresh beans are also sold. Dried beans are traditi ...
give it a higher content of
protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residue (biochemistry), residues. Proteins perform a vast array of functions within organisms, including Enzyme catalysis, catalysing metab ...
,
dietary fiber Dietary fiber (fibre in English in the Commonwealth of Nations, Commonwealth English) or roughage is the portion of plant-derived food that cannot be completely broken down by human digestive enzymes. Dietary fibers are diverse in chemical co ...
, and
vitamin Vitamins are Organic compound, organic molecules (or a set of closely related molecules called vitamer, vitamers) that are essential to an organism in small quantities for proper metabolism, metabolic function. Nutrient#Essential nutrients, ...
s. It has a firm
texture Texture may refer to: Science and technology * Image texture, the spatial arrangement of color or intensities in an image * Surface texture, the smoothness, roughness, or bumpiness of the surface of an object * Texture (roads), road surface c ...
and an earthy flavor, which becomes more pronounced as it ages.


Etymology

The term ''tempe'' is thought to be derived from the
Old Javanese Old Javanese or Kawi is an Austronesian languages, Austronesian language and the oldest attested phase of the Javanese language. It was natively spoken in the central and eastern part of Java Island, what is now Central Java, Special Region o ...
, a whitish food made of fried batter made from
sago Sago () is a starch extracted from the pith, or spongy core tissue, of various tropical palm stems, especially those of ''Metroxylon sagu''. It is a major staple food for the lowland peoples of New Guinea and the Maluku Islands, where it is c ...
or
rice flour Rice flour (also rice powder) is a form of flour made from finely milled rice. It is distinct from rice starch, which is usually produced by steeping rice in lye. Rice flour is a common substitute for wheat flour. It is also used as a thickening ...
which resembles '' rempeyek''. The historian Denys Lombard also suggests that it could be linked to a later term or '' tapai'' which means '
fermentation Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
'. In the western world, ''tempeh'' is the most common spelling. This is done to prevent readers from incorrectly pronouncing the word as "temp". The first known usage of this spelling is in an 1896 German article. Other spellings, such as ''témpé'', were also used, but ''tempeh'' has become the standard spelling in English since the 1960s.


History

Tempeh originated in Indonesia, according to historical evidence, tempeh was first made in Bayat, Klaten, Central Java, and was commonly consumed around 1700. The invention of tempeh seems to have arisen through the serendipitous introduction to stored soybeans of the fungus, which is crucial in tempeh's fermentation. This fungus grows on teakwood and sea hibiscus leaves, which native Javanese people often used (and still do) as food wrappings. In fact, in traditional tempeh making, an (a mycelium-filled leaf) is used, instead of store-bought . The type of soybean first used to make tempeh was the black soybean, which was a native plant. This later changed with the importation of white or yellow soybeans and the rise of the tofu industry on the island.


Debate over origins

Murdijati Gardjito, a food historian at Gadjah Mada University, argued that tempeh was made by native Javanese people and that its preparation predates the introduction of Chinese-style tofu products. Some ancient texts mention , old Javanese for 'native soybean tempeh'; was used to refer to the native soybean variety. White soybeans that are used to make most today used to be called ('white soybeans'), and were only available in Java centuries later. Mary Astuti, a food historian at Gadjah Mada University specializing in tempeh, argued that the native variety of soybean had been grown before the Chinese arrived in the region. Sri Tandjung noted that Javanese had been eating cooked (native black) soybeans since the 12th century. By the 16th or the 19th century, depending on which period of time the writer of
Serat Centhini ''Serat Centhini'' is a twelve-volume compilation of Javanese tales and teachings, written in verse and published in 1814. The work was commissioned, directed, and partially written by Crown Prince Mangkunegoro, later enthroned as Pakubuwono V o ...
referred to, Javanese people had mastered the art of cooking with tempeh, when it was not only eaten as is, but converted into different types of dishes, showing a full understanding and mastery of the food product. Gardjito noted that Javanese noble families rarely wrote about tempeh in ancient texts because it had never been a part of royal cuisine, but rather a staple food of the lower classes. Indonesian historian, Ong Hok Ham, suggests that tempeh might have been produced as a byproduct of , the Indonesian word for
tofu or bean curd is a food prepared by Coagulation (milk), coagulating soy milk and then pressing the resulting curds into solid white blocks of varying softness: ''silken'', ''soft'', ''firm'', and ''extra (or super) firm''. It originated in Chin ...
. He argued that the two food products are made of the same ingredient and that genetically speaking, soybeans are from China, though the specific variety was never mentioned. Food journalist, Andreas Maryoto. supported this idea, saying that tempeh might have been accidentally produced as the by-product of the tofu industry in Java in the 17th century, as discarded soybeans caught the spores of a whitish fungus that was found to be edible. However, was (and is still) made of white soybeans ('' Glycine max'', native to Japan and China), as opposed to the earliest version of that was made of native black soybeans ('' Glycine soja''). (tofu) made its way to Kediri in the 13th century and was consumed by the Mongolians who arrived in Java. Later, it was popular only among the rich (the complex production process and imported white soybeans led to its high price). Around the 17th or 19th century, became available to everyone. Tempeh later began to be made with white soybeans, leading to the decreased use of its native black variety. Black soybeans have been replaced by other commodity plants since. The original version of has been forgotten as has become the common people's food, and dependence on imported white soybeans grows.


Production

Tempeh begins with whole soybeans, which are softened by soaking, dehulled, then partly cooked. Specialty tempeh may be made from other types of
bean A bean is the seed of some plants in the legume family (Fabaceae) used as a vegetable for human consumption or animal feed. The seeds are often preserved through drying (a ''pulse''), but fresh beans are also sold. Dried beans are traditi ...
s,
wheat Wheat is a group of wild and crop domestication, domesticated Poaceae, grasses of the genus ''Triticum'' (). They are Agriculture, cultivated for their cereal grains, which are staple foods around the world. Well-known Taxonomy of wheat, whe ...
, or may include a mixture of beans and
whole grain A whole grain is a grain of any cereal and pseudocereal that contains the endosperm, germ, and bran, in contrast to refined grains, which retain only the endosperm. As part of a general healthy diet, consumption of whole grains is associated ...
s. Adding vinegar during soybeans soaking process had also been reported in tempeh industries and it had been found to influence the sensory nature of the final product. The principal step in making tempeh is the
fermentation Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
of soybeans which undergo inoculation with '' Rhizopus'' spp. molds, a type of filamentous fungus most widely used for the production of tempeh. A fermentation starter containing the spores of
fungus A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified as one ...
''Rhizopus oligosporus'' or ''Rhizopus oryzae'' is mixed in. The beans are spread into a thin layer and are allowed to ferment for 24 to 36 hours at a temperature around 30° C (86° F). The soybeans have to cool down to allow spore germination and abundant growth of
mycelium Mycelium (: mycelia) is a root-like structure of a fungus consisting of a mass of branching, thread-like hyphae. Its normal form is that of branched, slender, entangled, anastomosing, hyaline threads. Fungal colonies composed of mycelium are fo ...
. Later, the temperature of the beans will naturally rise and rapid mold growth happens for around 4 hours. As mold growth declines, the soybeans should be bound into a solid mass by the mycelium. In good tempeh, the beans are knitted together by a mat of white
mycelium Mycelium (: mycelia) is a root-like structure of a fungus consisting of a mass of branching, thread-like hyphae. Its normal form is that of branched, slender, entangled, anastomosing, hyaline threads. Fungal colonies composed of mycelium are fo ...
. Typically, tempeh is harvested after 48 hours of fermentation with its distinguishable whitish color, firm texture, and nutty flavor. Extended fermentation time results in an increase in pH and undesirable color darkening in the tempeh. During the fermentation process, optimal time of fermentation, temperature, oxygen, humidity, and pH levels are required to encourage the growth of the ''Rhizopus'' mold, while discouraging the growth of undesired microorganisms. The pH level should be kept around 3-5 by adding a mild
acidulant Acidulants are chemical compounds that give a tart, sour, or acidic flavor to foods or enhance the perceived sweetness of foods. Acidulants can also function as leavening agents and emulsifiers in some kinds of processed foods.Berry, S.K.. (2001). ...
such as
vinegar Vinegar () is an aqueous solution of diluted acetic acid and trace compounds that may include flavorings. Vinegar typically contains from 5% to 18% acetic acid by volume. Usually, the acetic acid is produced by a double fermentation, converting ...
,
lactic acid Lactic acid is an organic acid. It has the molecular formula C3H6O3. It is white in the solid state and it is miscible with water. When in the dissolved state, it forms a colorless solution. Production includes both artificial synthesis as wel ...
, or
acetic acid Acetic acid , systematically named ethanoic acid , is an acidic, colourless liquid and organic compound with the chemical formula (also written as , , or ). Vinegar is at least 4% acetic acid by volume, making acetic acid the main compone ...
, thereby favoring mold growth and restricting the growth of spoilage microorganisms. Oxygen is required for ''Rhizopus'' spp. growth, but should be maintained at low levels to prevent the production of undesired microorganisms. Under conditions of lower temperature, or higher ventilation, gray or black patches of
spore In biology, a spore is a unit of sexual reproduction, sexual (in fungi) or asexual reproduction that may be adapted for biological dispersal, dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores fo ...
s may form on the surface—this is not harmful, and should not affect the flavor or quality of the tempeh. This sporulation is normal on fully mature tempeh. A mild
ammonia Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the chemical formula, formula . A Binary compounds of hydrogen, stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinctive pu ...
smell may accompany good tempeh as it ferments, but it should not be overpowering. Traditional tempeh is often produced in
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
using '' Hibiscus tiliaceus'' leaves. The undersides of the leaves are covered in downy hairs (known technically as trichomes) to which the mold ''Rhizopus oligosporus'' can be found adhering in the wild.
Soybean The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean. Soy is a staple crop, the world's most grown legume, and an important animal feed. Soy is a key source o ...
s are pressed into the leaf, and stored. Fermentation occurs resulting in tempeh. In particular, the tempeh undergoes salt-free aerobic fermentation. Tempeh made with traditional inoculation methods are also more likely to include molds of other species including '' Rhizopus arrhizus'' and '' Rhizopus delemar'' which may outcompete Rhizopus oligosporus as the dominant mold. This results in white woolly appearance and more pleasant aroma compared with tempeh made with commercial starter containing only Rhizopus oligosporus. Famously these variant tempeh are found in
Malang Malang (; , ), historically known as Tumapel, is an inland List of regencies and cities of Indonesia, city in the Indonesian Provinces of Indonesia, province of East Java. It has a history dating back to the age of the Singhasari, Singhasari K ...
and Purwokerto in the 1960s, because Malang is located in a cool
plateau In geology and physical geography, a plateau (; ; : plateaus or plateaux), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. ...
, and tempeh made with ''Rhizopus oligosporus'' resulted in less compact and more alcoholic-smelling tempeh, while ''Rhizopus arrhizus'' required lower optimum temperature which made it more ideal. However the widespread use of commercial starter resulted in most tempeh in Java only containing ''Rhizopus oligosporus'', with few traditionally made tempeh outside Java still containing ''Rhizopus arrhizus'' and ''Rhizopus delemar''.


Dry matter losses and yield

During the processing of soybeans to make tempeh there are inevitable losses of material due to the removal of the hulls and the leaching of soluble compounds during the soaking, washing and cooking stages. Hulls constitute about 8% of the dry beans and losses due to the leaching of soluble compounds equate to 12 - 17% of the dry beans. The
oligosaccharides An oligosaccharide (; ) is a saccharide polymer containing a small number (typically three to ten) of monosaccharides (simple sugars). Oligosaccharides can have many functions including cell recognition and cell adhesion. They are normally presen ...
, stachyose, raffinose and
sucrose Sucrose, a disaccharide, is a sugar composed of glucose and fructose subunits. It is produced naturally in plants and is the main constituent of white sugar. It has the molecular formula . For human consumption, sucrose is extracted and refined ...
, can constitute up to 50% of the soluble materials lost. During the fermentation there is some further loss of material due to respiration by the mold and the oxidation of compounds to carbon dioxide and water. Reported losses of dry matter during the fermentation range from 2.1 to 10%. Hence, the overall yield of tempeh is in the range of 72-78 g tempeh per 100 g soybeans on a dry matter basis. In practical terms, this means that 100 g dry soybeans (7-9% moisture content) will yield about 170 to 210 g fresh tempeh (61-64% moisture content).


Determining quality

Once tempeh is produced, it is divided into three categories based on its quality: good, unfinished, and inedible. Good tempeh includes
bean A bean is the seed of some plants in the legume family (Fabaceae) used as a vegetable for human consumption or animal feed. The seeds are often preserved through drying (a ''pulse''), but fresh beans are also sold. Dried beans are traditi ...
s that are bound into a firm, compact cake by a dense, uniform, white
mycelium Mycelium (: mycelia) is a root-like structure of a fungus consisting of a mass of branching, thread-like hyphae. Its normal form is that of branched, slender, entangled, anastomosing, hyaline threads. Fungal colonies composed of mycelium are fo ...
, which should permeate the entire cake; the beans should be barely visible. The odor of good tempeh should be pleasant, clean, subtly sweet or resemble the aroma of mushrooms. The entire tempeh should lift as a single, cohesive cake without crumbling when shaken gently. Unfinished tempeh has beans that are bound together loosely by a sparse white mycelium, hence it crumbles easily. Unfinished tempeh should be incubated longer unless it has been incubated more than eight hours past the recommended time. If it has been incubated for enough time and still remains unfinished, it should be discarded. Inedible tempeh has beans with foul odor, resembling strong ammonia or alcohol, indicating the development of undesirable
bacteria Bacteria (; : bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of Prokaryote, prokaryotic microorganisms. Typically a few micr ...
due to excess moisture or overheating. Inedible tempeh cake is wet, slimy, and mushy with a collapsed structure. Its color is tan to brown and
mold A mold () or mould () is one of the structures that certain fungus, fungi can form. The dust-like, colored appearance of molds is due to the formation of Spore#Fungi, spores containing Secondary metabolite#Fungal secondary metabolites, fungal ...
develops in sparse patches.


Packaging

Food grade wrapping paper and perforated
polyethylene Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(methylene)) is the most commonly produced plastic. It is a polymer, primarily used for packaging (plastic bags, plastic films, geomembranes and containers including bott ...
bags are the most suitable materials for packaging tempeh. They have demonstrated good retention of the quality of tempeh and extension of the
shelf life Shelf life is the length of time that a commodity may be stored without becoming unfit for use, consumption, or sale. In other words, it might refer to whether a commodity should no longer be on a pantry shelf (unfit for use), or no longer on a s ...
of tempeh for three days compared to fresh tempeh. Appropriate packaging is important as it provides optimum oxygen supply and temperature for inoculation and
fermentation Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
to occur during processing. Tempeh is a perishable food and must be wrapped and placed into the refrigerator or freezer immediately after incubation or other processing steps such as blanching. In the refrigerator or freezer, stacking of tempeh should be minimized to prevent overheating and the undesirable, gradual continuation of fermentation, both of which shorten the storage life of tempeh. Even under cold temperature, tempeh continues to respire and undergo slow
decomposition Decomposition is the process by which dead organic substances are broken down into simpler organic or inorganic matter such as carbon dioxide, water, simple sugars and mineral salts. The process is a part of the nutrient cycle and is ess ...
from
microorganism A microorganism, or microbe, is an organism of microscopic scale, microscopic size, which may exist in its unicellular organism, single-celled form or as a Colony (biology)#Microbial colonies, colony of cells. The possible existence of unseen ...
s and its natural
enzyme An enzyme () is a protein that acts as a biological catalyst by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different mol ...
s. Therefore, tempeh should be well cooled for at least two to five hours in a cooler before it undergoes further packaging. Tempeh packaged in perforated polyethylene bags is usually repacked inside another labeled, non-perforated bag for distribution, sale and easier labeling. If the tempeh is packaged in only one perforated bag, the label must be directly attached to the perforated surface with the use of government food contact approved
adhesive Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantage ...
. It is then bulk packed in cartons and returned to the refrigerator or freezer to await shipment.


Nutrition

Tempeh is 60% water, 20%
protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residue (biochemistry), residues. Proteins perform a vast array of functions within organisms, including Enzyme catalysis, catalysing metab ...
, 8%
carbohydrate A carbohydrate () is a biomolecule composed of carbon (C), hydrogen (H), and oxygen (O) atoms. The typical hydrogen-to-oxygen atomic ratio is 2:1, analogous to that of water, and is represented by the empirical formula (where ''m'' and ''n'' ...
s, and 11%
fat In nutrition science, nutrition, biology, and chemistry, fat usually means any ester of fatty acids, or a mixture of such chemical compound, compounds, most commonly those that occur in living beings or in food. The term often refers specif ...
s (table). In a reference amount of , tempeh supplies 192
calorie The calorie is a unit of energy that originated from the caloric theory of heat. The large calorie, food calorie, dietary calorie, kilocalorie, or kilogram calorie is defined as the amount of heat needed to raise the temperature of one liter o ...
s, and is a rich source (20% or more of the Daily Value, DV) of several
B vitamins B vitamins are a class of water-soluble vitamins that play important roles in Cell (biology), cell metabolism and synthesis of red blood cells. They are a chemically diverse class of compounds. Dietary supplements containing all eight are referr ...
and
dietary mineral In the context of nutrition, a mineral is a chemical element. Some "minerals" are essential for life, but most are not. ''Minerals'' are one of the four groups of essential nutrients; the others are vitamins, essential fatty acids, and essent ...
s, such as
riboflavin Riboflavin, also known as vitamin B2, is a vitamin found in food and sold as a dietary supplement. It is essential to the formation of two major coenzymes, flavin mononucleotide and flavin adenine dinucleotide. These coenzymes are involved in ...
(30% DV) and
manganese Manganese is a chemical element; it has Symbol (chemistry), symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. It is a transition m ...
(62% DV), respectively (table).


Effects of fermentation

The soy carbohydrates in tempeh become more digestible as a result of the fermentation process. In particular, the
oligosaccharide An oligosaccharide (; ) is a carbohydrate, saccharide polymer containing a small number (typically three to ten) of monosaccharides (simple sugars). Oligosaccharides can have many functions including Cell–cell recognition, cell recognition and ce ...
s associated with flatulence and indigestion are greatly reduced by the ''Rhizopus'' culture. In traditional tempeh-making shops, the starter culture often contains bacteria that produce vitamins such as B12 (though it is uncertain whether this B12 is always present and bioavailable). In western countries, it is more common to use a pure culture containing only ''Rhizopus oligosporus'', which makes little B12 and could be missing ''
Citrobacter freundii ''Citrobacter'' is a genus of Gram-negative, aerobic, rod-shaped coliform bacteria of the Enterobacteriaceae family. ''Citrobacter'' spp. cause opportunistic infections (including urinary tract infections, gastroenteritis, and bacteremia). ...
'' and '' Klebsiella pneumoniae'', which have been shown to produce significant levels of B12 analogs in tempeh when present. Studies of fortifying tempeh with vitamin B12 through fermentation using microorganisms indicate that lactic acid bacteria and propionic acid bacteria produce vitamin B12.


Preparation

In the kitchen, tempeh is often simply prepared by cutting it into pieces, soaking in
brine Brine (or briny water) is a high-concentration solution of salt (typically sodium chloride or calcium chloride) in water. In diverse contexts, ''brine'' may refer to the salt solutions ranging from about 3.5% (a typical concentration of seawat ...
or a salty sauce, and then fried. In Java, tempeh is often traditionally prepared by cutting it into pieces, marinating it in a mixture of ground
garlic Garlic (''Allium sativum'') is a species of bulbous flowering plants in the genus '' Allium''. Its close relatives include the onion, shallot, leek, chives, Welsh onion, and Chinese onion. Garlic is native to central and south Asia, str ...
,
coriander Coriander (), whose leaves are known as cilantro () in the U.S. and parts of Canada, and dhania in parts of South Asia and Africa, is an annual plant, annual herb (''Coriandrum sativum'') in the family Apiaceae. Most people perceive the ...
,
turmeric Turmeric (), or ''Curcuma longa'' (), is a flowering plant in the ginger family Zingiberaceae. It is a perennial, rhizomatous, herbaceous plant native to the Indian subcontinent and Southeast Asia that requires temperatures between and high ...
, salt and water; then deep fried, and it's often served with '' sambal ulek'' chili paste. Cooked tempeh can be eaten alone, or used in chili, stir fries, soups, salads, sandwiches, and stews. Tempeh's complex flavor has been described as nutty, meaty, and mushroom-like. It freezes well, and is now commonly available in many western supermarkets, as well as in ethnic markets and health food stores. Tempeh can be steamed, marinated, thinly sliced, blackened, or crumbled into sauces and stews. Tempeh performs well in a cheese grater, after which it may be used in place of ground beef (as in tacos). When thin-sliced and deep-fried in oil, tempeh obtains a crisp golden crust while maintaining a soft interior. Its sponge-like consistency makes it suitable for marinating. Dried tempeh (whether cooked or raw) is more portable and less perishable and may be used as a stew base. Sometimes when tempeh is diced and left, it will create white feathery fluff which bonds the cut—this is the Rhizopus mold still growing—this is normal and perfectly edible.


Types

The most common and widely known tempeh is made from fermented soybeans, called or , made from controlled fermentation of
soybeans The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean. Soy is a staple crop, the world's most grown legume, and an important animal feed. Soy is a key source of f ...
. However, traditionally other ingredients such as (tofu dregs/ okara), (coconut dregs) and peanuts may be used in a fashion similar to the tempeh-making process, although perhaps using different fungi or attracting other microbes like '' kara benguk'' or '' kara pedhang'', which can be toxic if not prepared correctly. A related product to tempeh is '' oncom'', which is made from
peanut The peanut (''Arachis hypogaea''), also known as the groundnut, goober (US), goober pea, pindar (US) or monkey nut (UK), is a legume crop grown mainly for its edible seeds. It is widely grown in the tropics and subtropics by small and large ...
press cake or soy dregs and is prevalent in Sundanese culture in
West Java West Java (, ) is an Indonesian Provinces of Indonesia, province on the western part of the island of Java, with its provincial capital in Bandung. West Java is bordered by the province of Banten and the country's capital region of Jakarta to t ...
. There are two types of ''oncom'': a bright red-orange kind with '' Neurospora sitophila'', and a black one with the same fungi as tempeh uses. Tempeh can also be differentiated according to its degrees of maturity (i.e. the mycelium's growth/age). is a tempeh that is not fully fermented, that is, the mycelium has not fully covered the surface. The taste of the beans is more solid and profound. Sometimes tempeh is left to ferment further, creating more pungent varieties: (day-old tempeh), i.e. when the tempeh starts to age; (a few-days old tempeh), i.e. when the tempeh becomes yellowish, a bit slimy, and the smell becomes more potent; and (), when the mycelium has acquired a blackened coloration and the product has a putrid smell. Some types of tempeh are made of ingredients that would be otherwise wasted if not used. According to traditional Javanese customs, wasting food is deemed as a sign of disrespect to Nature and other beings, and encourages efforts to use every part of an ingredient. The wrappings used in tempeh making can contribute to its flavor and aroma. Though some prefer the traditional banana, or teak leaf, readily available
plastic Plastics are a wide range of synthetic polymers, synthetic or Semisynthesis, semisynthetic materials composed primarily of Polymer, polymers. Their defining characteristic, Plasticity (physics), plasticity, allows them to be Injection moulding ...
sheet wrappings have been increasingly widely used.


Soft and fluffy tempeh made from soy pulp or tofu dregs. usually can be found in traditional markets of
Java Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...
, at a price lower than that of common soybean tempeh. It is made into a variety of dishes; for example it can be battered and/or fried, used in , or . is known by different names across
Java Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...
; for example as or in Temanggung.


In
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
, ripe tempeh (two or more days old) is considered a delicacy. Names include ('stinky tempeh') in
Java Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...
, ('almost rotten') tempeh or ('yesterday tempeh'). Having a slightly pungent aroma, small amounts are used as a flavoring agent in traditional Javanese '' sayur lodeh'' vegetable stew and '' sambal tumpang''.


In Javanese, the term means 'leaf'. Traditionally tempeh is wrapped in organic banana leaf, ('' Hibiscus tiliaceus'' leaf) or ( teak leaf).


Pure soybean cake, tempeh made in plastic wrap without any fillings or additives such as grated raw papaya. This was meant to create a more "hygienic and pure" tempeh free from any impurities or unwanted microbes.


A specialty of
Malang Malang (; , ), historically known as Tumapel, is an inland List of regencies and cities of Indonesia, city in the Indonesian Provinces of Indonesia, province of East Java. It has a history dating back to the age of the Singhasari, Singhasari K ...
, the rough-textured is made from black soybeans mixed with other ingredients, such as peanut dregs, cassava fiber, and soybean meal. The process of making is quite similar to black ''oncom''.


is a variety of tempeh from
Central Java Central Java (, ) is a Provinces of Indonesia, province of Indonesia, located in the middle of the island of Java. Its administrative capital is Semarang. It is bordered by West Java in the west, the Indian Ocean and the Special Region of Yogya ...
, notably Banyumas. It is prepared with
coconut The coconut tree (''Cocos nucifera'') is a member of the palm tree family (biology), family (Arecaceae) and the only living species of the genus ''Cocos''. The term "coconut" (or the archaic "cocoanut") can refer to the whole coconut palm, ...
dregs. This type of tempeh served as a main source of protein in Java due to its inexpensiveness and has led to several cases of fatal food poisoning, as it occasionally gets contaminated with the bacterium '' Burkholderia gladioli'', and the unwanted organism produces toxins ( bongkrek acid and toxoflavin) from the coconut, besides killing off the ''Rhizopus'' fungus due to the
antibiotic An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting pathogenic bacteria, bacterial infections, and antibiotic medications are widely used in the therapy ...
activity of acid. Fatalities from contaminated were once common in the area where it was produced. During 1930s, Indonesian government went through an
economic depression An economic depression is a period of carried long-term economic downturn that is the result of lowered economic activity in one or more major national economies. It is often understood in economics that economic crisis and the following recession ...
, and this condition caused some of the people to make tempe bongkrek by themselves, instead of buying it directly from well-trained producers. As a result, the poisonings occurred frequently, reaching 10 to 12 a year. Dutch scientists W. K. Mertens and A. G. van Veen from the Eijkman Institute of Jakarta, started to find the cause of the poisoning in the early 1930s. The first outbreak of the bongkrek poisoning by tempe bongkrek was recorded by Dutch researchers; however, no further research to find the cause of the poisoning was conducted in 1895. They successfully identified the source of poisoning as a bacterium called '' Pseudomonas cocovenenans''. This bacterium, which is also named '' Burkholderia cocovenenans'', caused the synthesis of a poisonous substance called bongkrek acid. '' B. cocovenenans '' is commonly found in plants and soil, which can be taken up by coconuts and corn, leading to the synthesis of bongkrek acid during the
fermentation Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
of such foods. Since 1975, consumption of contaminated tempe bongkrek has caused more than 3000 cases of bongkrek acid poisoning. In Indonesia, the overall reported mortality rate has turned out to be 60%. Due to the severity of the situation, the production of tempe bongkrek has been banned since 1988. Clandestine manufacture continues, however, due to the popular flavor. The problem of contamination is not encountered with bean and grain tempeh, which have a different composition of
fatty acid In chemistry, in particular in biochemistry, a fatty acid is a carboxylic acid with an aliphatic chain, which is either saturated and unsaturated compounds#Organic chemistry, saturated or unsaturated. Most naturally occurring fatty acids have an ...
s that is not favorable for the growth of ''B. gladioli'', but encourages growth of ''Rhizopus'' instead. When bean or grain tempeh has the proper color, texture and smell, it is a very strong indication the product is safe. Yellow is always highly toxic due to toxoflavin, but with a normal coloration may still contain lethal amounts of acid.


Oat tempeh

A form of tempeh based on
barley Barley (), a member of the grass family, is a major cereal grain grown in temperate climates globally. It was one of the first cultivated grains; it was domesticated in the Fertile Crescent around 9000 BC, giving it nonshattering spikele ...
and oats instead of soy was developed by scientists at the Swedish Department of Food Science in 2008. It can be produced in climatic regions where it is not possible to grow soybeans.


Cooking methods and recipes

The simplest way to cook tempeh is by
frying Frying is the cooking of food in cooking oil, oil or another fat. Similar to sautéing, pan-fried foods are generally turned over once or twice during cooking to make sure that the food is evenly cooked, using tongs or a spatula, whilst sautéed ...
. It is both deep-fried and stir-fried. However, there are several cooking methods and recipe variations. Among others are:


Perhaps the simplest and most popular way to prepare tempeh in
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
. The tempeh is sliced and seasoned in a mixture of ground
garlic Garlic (''Allium sativum'') is a species of bulbous flowering plants in the genus '' Allium''. Its close relatives include the onion, shallot, leek, chives, Welsh onion, and Chinese onion. Garlic is native to central and south Asia, str ...
,
coriander Coriander (), whose leaves are known as cilantro () in the U.S. and parts of Canada, and dhania in parts of South Asia and Africa, is an annual plant, annual herb (''Coriandrum sativum'') in the family Apiaceae. Most people perceive the ...
seeds and salt, and then deep fried in
palm oil Palm oil is an edible vegetable oil derived from the mesocarp (reddish pulp) of the fruit of oil palms. The oil is used in food manufacturing, in beauty products, and as biofuel. Palm oil accounted for about 36% of global oils produced from o ...
. The tempeh might be coated in batter prior to frying, or directly fried without any batter. Fried unbattered tempeh has a golden-brown color when done.


is a traditional Javanese dish originating in
Central Java Central Java (, ) is a Provinces of Indonesia, province of Indonesia, located in the middle of the island of Java. Its administrative capital is Semarang. It is bordered by West Java in the west, the Indian Ocean and the Special Region of Yogya ...
. is a Javanese cooking method of braising in spices and
palm sugar Palm sugar is a sweetener derived from any variety of palm tree. Palm sugar may be qualified by the type of palm, as in coconut palm sugar. While sugars from different palms may have slightly different compositions, all are processed simila ...
and boiling the food in a closed place until the water runs out. The tempeh is first braised in a mixture of coconut water,
palm sugar Palm sugar is a sweetener derived from any variety of palm tree. Palm sugar may be qualified by the type of palm, as in coconut palm sugar. While sugars from different palms may have slightly different compositions, all are processed simila ...
, and spices including coriander seeds, shallots, galangal, and bay leaves, and then briefly deep-fried. The result is a moist, sweet and spicy, dark-colored tempeh. Tofu may also be used, yielding .


This variation is often found in Purwokerto. The word originates in the Banyumas regional
dialect A dialect is a Variety (linguistics), variety of language spoken by a particular group of people. This may include dominant and standard language, standardized varieties as well as Vernacular language, vernacular, unwritten, or non-standardize ...
, and means 'flash-fried'. The tempeh is first dipped in spiced flour before quickly frying in very hot oil, resulting in a product that is cooked on the outside, but raw or only partially so on the inside. It has a limp, soft texture compared to the more common, crisp, fully fried tempeh.


Also known as (lit: 'dry tempeh'), or if mixed with plenty of hot and spicy '' sambal''
chili pepper Chili peppers, also spelled chile or chilli ( ), are varieties of fruit#Berries, berry-fruit plants from the genus ''Capsicum'', which are members of the nightshade family Solanaceae, cultivated for their pungency. They are used as a spice to ...
sauce. It is a crispy, sweet and spicy, fried tempeh. The raw tempeh is cut into small sticks and thoroughly deep-fried until no longer moist, and then mixed with palm sugar,
chili pepper Chili peppers, also spelled chile or chilli ( ), are varieties of fruit#Berries, berry-fruit plants from the genus ''Capsicum'', which are members of the nightshade family Solanaceae, cultivated for their pungency. They are used as a spice to ...
or other spices, or with sweet soy sauce. Often it is mixed with separately fried peanuts and anchovies (). This dry tempeh will keep for up to a month if cooked and stored properly.


or

This variation is almost identical to , but is more soft and moist. The sweet taste is due to generous addition of '' kecap manis'' (sweet soy sauce).


or

Stir-fried tempeh with vegetables such as green bean, basil, or onion, with spices. Other recipes might add
coconut milk Coconut milk is a plant milk extracted from the grated pulp of mature coconuts. The opacity and rich taste of the milky-white liquid are due to its high oil content, most of which is saturated fat. Coconut milk is a traditional food ingred ...
for a milky-colored, and rather moist, stir-fried tempeh.


Fried tempeh mixed with '' sambal'' chili paste in a mortar and pestle. Usually served in addition to other dishes, such as '' ayam penyet'' (chicken) or '' iga penyet'' (ribs).


Tempeh skewered and grilled as
satay Satay ( , in the US also ), or sate in Indonesia, is a Javanese cuisine, Javanese dish of seasoned, skewered and grilled meat, served with a sauce. Satay originated in Java, but has spread throughout Indonesia, into Southeast Asia, Europe, ...
. ( Javanese for 'poor man's satay') from
Solo Solo or SOLO may refer to: Arts and entertainment Characters * Han Solo, a ''Star Wars'' character * Jacen Solo, a Jedi in the non-canonical ''Star Wars Legends'' continuity * Kylo Ren (Ben Solo), a ''Star Wars'' character * Napoleon Solo, fr ...
in
Central Java Central Java (, ) is a Provinces of Indonesia, province of Indonesia, located in the middle of the island of Java. Its administrative capital is Semarang. It is bordered by West Java in the west, the Indian Ocean and the Special Region of Yogya ...
is made from fluffy . Ground tempeh can also be made into a thick sauce, such as in , a chicken satay from Kebumen,
Central Java Central Java (, ) is a Provinces of Indonesia, province of Indonesia, located in the middle of the island of Java. Its administrative capital is Semarang. It is bordered by West Java in the west, the Indian Ocean and the Special Region of Yogya ...
where tempeh flavored with chili and spices replaces the more common
peanut sauce Peanut sauce, satay sauce (saté sauce), ''bumbu kacang'', ''sambal kacang'', or ''pecel'' is an Indonesian cuisine, Indonesian sauce made from ground roasted or fried peanuts, widely used in Indonesian cuisine and many other dishes throughout t ...
.


'' Kripik'' snack crackers; a thinly sliced tempeh, battered and deep fried until crispy. It is popular across Java, but notably produced in
Bandung Bandung is the capital city of the West Java province of Indonesia. Located on the island of Java, the city is the List of Indonesian cities by population, fourth-most populous city and fourth largest city in Indonesia after Jakarta, Surabay ...
,
West Java West Java (, ) is an Indonesian Provinces of Indonesia, province on the western part of the island of Java, with its provincial capital in Bandung. West Java is bordered by the province of Banten and the country's capital region of Jakarta to t ...
and
Malang Malang (; , ), historically known as Tumapel, is an inland List of regencies and cities of Indonesia, city in the Indonesian Provinces of Indonesia, province of East Java. It has a history dating back to the age of the Singhasari, Singhasari K ...
,
East Java East Java (, , ) is a Provinces of Indonesia, province of Indonesia located in the easternmost third of Java island. It has a land border only with the province of Central Java to the west; the Java Sea and the Indian Ocean border its northern ...
.


Tempeh sandwich or tempeh burger

Fried, grilled or otherwise cooked tempeh patties, sandwiched between slices of bread or hamburger buns with salad, sauces or seasonings. File:Indonesian fried tempeh.JPG, The common ''tempeh goreng'' (un-battered) in
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
File:Tempeh.jpg, Fried tempeh (battered) sold at a food court in
Singapore Singapore, officially the Republic of Singapore, is an island country and city-state in Southeast Asia. The country's territory comprises one main island, 63 satellite islands and islets, and one outlying islet. It is about one degree ...
File:Tempe bacem lauk soto Pak Marto.JPG, File:Tempe Mendoan Kebumen Super Nampol.jpg, File:Sambal goreng tempe.JPG, or File:Orak-arik tempe.JPG, or File:Sambal tempe penyet kemangi.JPG, File:Tempe goreng snack.JPG, Crispy '' kripik'' tempeh as a snack File:Menjes kacang Malang goreng.JPG, Fried ''menjes kacang'' File:Grilled tempeh and vegetables (7603211410).jpg, Grilled tempeh File:TLT sandwich.jpg, Tempeh sandwich


Preservation

Freshly made, raw tempeh remains edible for a few days at room temperature. It is neither acidic nor does it contain significant amounts of
alcohol Alcohol may refer to: Common uses * Alcohol (chemistry), a class of compounds * Ethanol, one of several alcohols, commonly known as alcohol in everyday life ** Alcohol (drug), intoxicant found in alcoholic beverages ** Alcoholic beverage, an alco ...
. It, however, does possess stronger resistance to lipid peroxidation than unfermented soybeans due to its
antioxidant Antioxidants are Chemical compound, compounds that inhibit Redox, oxidation, a chemical reaction that can produce Radical (chemistry), free radicals. Autoxidation leads to degradation of organic compounds, including living matter. Antioxidants ...
contents. Cooked as , the deep-fried and seasoned bits of tempeh can last for a month or more and still be good to consume, if cooked correctly and stored properly in an air-tight jar. The deep-frying process removes the moisture, preventing further fermentation and deterioration, thus prolonging its shelf life.


Antimicrobial agents

'' Rhizopus'' cultures responsible for the
fermentation Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduce ...
of tempeh from soybean produce natural, heat-stable
antimicrobial agents An antimicrobial is an agent that kills microorganisms (microbicide) or stops their growth ( bacteriostatic agent). Antimicrobial medicines can be grouped according to the microorganisms they are used to treat. For example, antibiotics are used ag ...
against spoilage and disease-causing microorganisms, extending the
shelf life Shelf life is the length of time that a commodity may be stored without becoming unfit for use, consumption, or sale. In other words, it might refer to whether a commodity should no longer be on a pantry shelf (unfit for use), or no longer on a s ...
of the fermented product through microbial antagonism. The mold is capable of inhibiting the growth of other fungi such as ''
Aspergillus flavus ''Aspergillus flavus'' is a saprotrophic and pathogenic fungus with a cosmopolitan distribution. It is best known for its colonization of cereal grains, legumes, and tree nuts. Postharvest rot typically develops during harvest, storage, and/or ...
'' and ''
Aspergillus parasiticus ''Aspergillus'' () is a genus consisting of several hundred mold species found in various climates worldwide. ''Aspergillus'' was first catalogued in 1729 by the Italian priest and biologist Pier Antonio Micheli. Viewing the fungi under a microsc ...
'' by interfering with the accumulation of
aflatoxin Aflatoxins are various toxicity, poisonous carcinogens and mutagens that are produced by certain Mold (fungus), molds, especially ''Aspergillus'' species such as ''Aspergillus flavus'' and ''Aspergillus parasiticus''. According to the USDA, "The ...
(especially aflatoxin B1), the mycotoxin of greatest concern. ''R. oligosporus'' has also been reported to produce four to five antibacterial substances during fermentation process. It produces phenolic compounds against pathogenic bacteria such as ''
Helicobacter pylori ''Helicobacter pylori'', previously known as ''Campylobacter pylori'', is a gram-negative, Flagellum#bacterial, flagellated, Bacterial cellular morphologies#Helical, helical bacterium. Mutants can have a rod or curved rod shape that exhibits l ...
'' and an antibacterial protein has been identified with activities against ''
Bacillus ''Bacillus'', from Latin "bacillus", meaning "little staff, wand", is a genus of Gram-positive, rod-shaped bacteria, a member of the phylum ''Bacillota'', with 266 named species. The term is also used to describe the shape (rod) of other so-sh ...
'' species (especially against ''
Bacillus subtilis ''Bacillus subtilis'' (), known also as the hay bacillus or grass bacillus, is a gram-positive, catalase-positive bacterium, found in soil and the gastrointestinal tract of ruminants, humans and marine sponges. As a member of the genus ''Bacill ...
'' and ''
Bacillus cereus ''Bacillus cereus'' is a Gram-positive bacteria, Gram-positive Bacillus, rod-shaped bacterium commonly found in soil, food, and marine sponges. The specific name, ''cereus'', meaning "waxy" in Latin, refers to the appearance of colonies grown o ...
''), ''
Staphylococcus aureus ''Staphylococcus aureus'' is a Gram-positive spherically shaped bacterium, a member of the Bacillota, and is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin. It is often posi ...
'', and '' Streptococcus cremoris''.


Non-refrigerated fresh tempeh

Tempeh can be sold and consumed fresh within 48 hours once removed from its incubator. It is commonly transported to the market in its incubation container (e.g.
polyethylene Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(methylene)) is the most commonly produced plastic. It is a polymer, primarily used for packaging (plastic bags, plastic films, geomembranes and containers including bott ...
bag, banana leaf wrapper, etc.) and placed in the shade. In areas with warmer climates, tempeh can be kept at room temperature for one to three days before it becomes overripe. In locations with more temperate temperatures, it can keep for one to four days but will usually need to be refrigerated to prevent spoilage.


Refrigeration

Fresh refrigerated tempeh should be sealed in a labeled polyethylene bag and kept in temperatures below . It can be kept at this temperature for three to five days and sometimes, even as long as a week. Storage life could be extended to two or three weeks if the tempeh is blanched or steamed prior to refrigeration due to the inactivation of enzymes and destruction of bacteria.


Freezing

Freezing Freezing is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point. For most substances, the melting and freezing points are the same temperature; however, certain substances possess dif ...
is the preferred way to preserve tempeh due to its capability for wide distribution. Tempeh can be frozen whole or in slices, depending on preference. During the freezing process, whole tempeh is placed in its perforated wrapper whereas sliced tempeh is packaged in a labelled polyethylene bag prior to being sealed in an outer bag and then frozen immediately. This method will keep for months with only a small loss of texture and flavor.


Blanching

Blanching tempeh by steaming or parboiling helps to extend the storage life by preventing bacterial growth, stopping mold growth and inactivating enzymes. Steaming appears to have a less negative effect than parboiling in terms of texture, flavor and nutritional value. Blanching is a great method for preserving tempeh prior to refrigeration, though not as beneficial for tempeh that is to be frozen.


Dehydration


Air tray drying

Tempeh can be dried via the air tray drying method. Cubes of tempeh placed on steel, mesh bottom trays are dried by the circulating hot air dryer. After the product is finished, they can be cut into squares at for 90 to 120 minutes in order to reduce moisture content to 2–4%. When placed in moisture proof Pliofilm bags, the tempeh has a shelf life of several months at room temperature. Although this is a convenient method that produces a shelf stable product without requirement of refrigeration, the process of hot air drying can cause a significant loss of nutritional content such as the soluble solids and
nitrogen Nitrogen is a chemical element; it has Symbol (chemistry), symbol N and atomic number 7. Nitrogen is a Nonmetal (chemistry), nonmetal and the lightest member of pnictogen, group 15 of the periodic table, often called the Pnictogen, pnictogens. ...
protein content.


Sun drying

This preservation method is most economical out of all methods. The tempeh can be blanched prior to dehydration to preserve flavor and prolong shelf life. Tempeh is exposed to internal solar dryer temperature of in this method. A disadvantage of this method is that sunlight can destroy some of the
vitamin B12 Vitamin B12, also known as cobalamin, is a water-soluble vitamin involved in metabolism. One of eight B vitamins, it serves as a vital cofactor (biochemistry), cofactor in DNA synthesis and both fatty acid metabolism, fatty acid and amino a ...
of tempeh.


Freeze-drying

This method is the most expensive out of all dehydration methods but provides the advantage of long stable shelf life at room temperature and an excellent retention of soluble nutrients (nitrogen protein and other solids). The product undergoes quick freeze at and is then dried at a moderate temperature inside a strong
vacuum A vacuum (: vacuums or vacua) is space devoid of matter. The word is derived from the Latin adjective (neuter ) meaning "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressur ...
. Due to the expensive nature of the equipment, the final product price is higher than tempeh preserved through other methods.


Spray-drying

As this method is traditionally used for small particles, it is used to produce tempeh powder for products such as
soup Soup is a primarily liquid food, generally served warm or hot – though it is sometimes served chilled – made by cooking or otherwise combining meat or vegetables with Stock (food), stock, milk, or water. According to ''The Oxford Compan ...
s,
bread Bread is a baked food product made from water, flour, and often yeast. It is a staple food across the world, particularly in Europe and the Middle East. Throughout recorded history and around the world, it has been an important part of many cu ...
s, tortillas, etc. However, this method can be expensive due to the bulky nature of the equipment.


Deep-frying

This method produces ready to eat tempeh products. A culinary oil with a high smoke point, such as rapeseed, soy,
safflower Safflower (''Carthamus tinctorius'') is a highly branched, herbaceous, thistle-like annual plant in the family Asteraceae. It is one of the world's oldest crops; today, it is commercially cultivated for vegetable oil extracted from the seeds. ...
,
peanut The peanut (''Arachis hypogaea''), also known as the groundnut, goober (US), goober pea, pindar (US) or monkey nut (UK), is a legume crop grown mainly for its edible seeds. It is widely grown in the tropics and subtropics by small and large ...
, or
coconut The coconut tree (''Cocos nucifera'') is a member of the palm tree family (biology), family (Arecaceae) and the only living species of the genus ''Cocos''. The term "coconut" (or the archaic "cocoanut") can refer to the whole coconut palm, ...
oil, is heated to in the deep fryer. The tempeh is deep-fried until golden brown and crisp, and then cooled quickly in a sterile environment to be sealed in Pliofilm bags and stored in a cool, dry place. The shelf life of this product lasts around a week but can be extended if the tempeh is sun dried or oven dried prior to deep frying.


See also

* List of fermented soy products * List of meat substitutes * List of soy-based foods *'' Miso'' *''
Nattō is a traditional Japanese cuisine, Japanese food made from whole soybeans that have been Fermentation in food processing, fermented with Bacillus subtilis, ''Bacillus subtilis'' var. ''natto''. It is often served as a breakfast food with rice. ...
'' *'' Oncom'' *'' Tapai'' * *
Veganism Veganism is the practice of abstaining from the use of animal products and the consumption of animal source foods, and an associated philosophy that rejects the commodity status of animals. A person who practices veganism is known as a vega ...


References

{{Authority control Fermented soy-based foods Soy-based foods Meat substitutes Vegetarian cuisine Vegan cuisine Javanese culture Vegetarian dishes of Indonesia Dried foods