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(i) (i) (i) (i) (i)

TOFU, also known as BEAN CURD, is a food cultivated by coagulating soy milk and then pressing the resulting curds into soft white blocks. It is a component in East Asian and Southeast Asian cuisines . Tofu can be soft, firm, or extra firm. Tofu
Tofu
has a subtle flavor and can be used in savory and sweet dishes. It is often seasoned or marinated to suit the dish.

Tofu-making was first recorded during the Chinese Han dynasty
Han dynasty
some 2,000 years ago. Chinese legend ascribes its invention to prince Liu An (179–122 BC). Tofu
Tofu
and its production technique were introduced into Korea
Korea
and then Japan
Japan
during the Nara period (710–794). Some scholars believe tofu arrived in Vietnam
Vietnam
during the 10th and 11th century. It spread into other parts of Southeast Asia
Southeast Asia
as well. This spread probably coincided with the spread of Buddhism
Buddhism
because it is an important source of protein in the vegetarian diet of East Asian Buddhism
Buddhism
. Li Shizhen in the Ming Dynasty described a method of making tofu in the Compendium of Materia Medica .

Tofu
Tofu
has a low calorie count and relatively large amounts of protein . It is high in iron , and depending on the coagulants used in manufacturing (e.g. calcium chloride , calcium sulfate , magnesium sulfate ), it can have a high calcium or magnesium content.

The term tofu is used by extension for similarly textured curdled dishes that do not use soy products, such as "almond tofu" (almond jelly ), tamago-dōfu (ja) (egg), goma-dōfu (ja) (sesame), or peanut tofu (Chinese 落花生豆腐 luòhuāshēng dòufu and Okinawan jīmāmi-dōfu (ja)).

CONTENTS

* 1 History

* 1.1 Etymology * 1.2 Three theories of origin * 1.3 In Asia * 1.4 In the West

* 2 Production

* 2.1 Salt coagulants * 2.2 Acid coagulants * 2.3 Enzyme coagulants * 2.4 Colour * 2.5 Flavour

* 3 Varieties

* 3.1 Fresh tofu

* 3.1.1 Extra soft tofu * 3.1.2 Soft or silken tofu * 3.1.3 Firm tofu * 3.1.4 Extra firm tofu

* 3.2 Processed tofu

* 3.2.1 Fermented * 3.2.2 Dried tofu * 3.2.3 Fried * 3.2.4 Frozen

* 3.3 By-products of tofu production

* 3.3.1 Tofu skin * 3.3.2 Okara

* 3.4 Other tofus

* 3.4.1 Sweets * 3.4.2 Egg tofu * 3.4.3 Sesame
Sesame
tofu * 3.4.4 Peanut
Peanut
tofu * 3.4.5 Burmese tofu

* 4 Preparation

* 4.1 Eastern methods

* 4.1.1 Lightly flavored * 4.1.2 Fried * 4.1.3 Soups, stews, and braised dishes * 4.1.4 Smoked * 4.1.5 Bacem * 4.1.6 As flavoring

* 4.2 Western methods

* 5 Nutrition
Nutrition
and health

* 5.1 Traditional
Traditional
Chinese medicine claims * 5.2 Functions * 5.3 Protein
Protein

* 6 Allergies * 7 Chemistry of tofu

* 8 Gelation of tofu

* 8.1 Proteins

* 8.1.1 Denaturation of glycinin and Β-conglycinin

* 8.2 Storage

* 9 See also * 10 References * 11 External links

HISTORY

ETYMOLOGY

The English term "tofu" comes from Japanese tōfu (豆腐), borrowed from the original Chinese equivalent (豆腐 dòufu (pinyin ), literally "bean" (豆) + "curdled" or "fermented" (腐).

A reference to the word "towfu" exists in a letter dated 1770 from the English merchant James Flint to United States statesman and scientist Benjamin Franklin
Benjamin Franklin
. This is believed to be the first documented usage of the word in English.

The term "bean curd(s)" for tofu has been used in the United States since at least 1840. It is not frequently used, however, in the United Kingdom, Australia
Australia
or New Zealand.

THREE THEORIES OF ORIGIN

The most commonly held of the three theories of tofu's origin maintains that tofu was invented in northern China
China
around 164 BC by Lord Liu An , a Han Dynasty
Han Dynasty
prince. Although this is possible, the paucity of concrete information about this period makes it difficult to conclusively determine whether Liu An himself invented the method for making tofu. In Chinese history , important inventions were often attributed to important leaders and figures of the time. In 1960, a stone mural unearthed from an Eastern Han dynasty
Han dynasty
tomb provided support for the theory of Han origin of tofu, however some scholars maintained that the tofu in Han dynasty
Han dynasty
was rudimentary, and lacked the firmness and taste of real tofu.

Another theory states that the production method for tofu was discovered accidentally when a slurry of boiled, ground soybeans was mixed with impure sea salt . Such sea salt would probably have contained calcium and magnesium salts, allowing the soy mixture to curdle and produce a tofu-like gel. Korean sundubu (soft tofu) and Okinawan tofu is still produced in a similar manner, traditionally using seawater as a coagulant. This may possibly have been the way tofu was discovered, since soy milk has been eaten as a savory soup in ancient as well as modern times. Its technical plausibility notwithstanding, there is little evidence to prove or disprove that tofu production originated in this way.

The last group of theories maintains that the ancient Chinese learned the method for curdling soy milk by emulating the milk curdling techniques of the Mongolians or East Indians . Despite their advanced culture, no technology or knowledge of culturing and processing milk products existed within ancient Chinese society. (They did not seek such technology, probably because of the Confucian taboo on fermented dairy products and other so-called "barbarian foodstuffs".) The primary evidence for this theory is the etymological similarity between the Chinese term for Mongolian fermented milk (rufu, which literally means "milk curdled") and the term doufu ("beans curdled") or tofu. Although intriguing and possible, there is no evidence to substantiate this theory beyond academic speculation.

IN ASIA

See also: List of Chinese inventions Tofu
Tofu
and potatoes grilled at a street stall in Yuanyang , Yunnan
Yunnan
province, China
China

A form of tofu may have been discovered during the Han dynasty
Han dynasty
(220 BC – AD 220), but it did not become a popular food in China
China
until the Song dynasty
Song dynasty
(960–1279). Tofu
Tofu
was then introduced to Japan
Japan
by Zen Buddhist monks, who at first called it "Chinese curd" (唐腐, tōfu). Much of tofu's early use in Asia was as a vegetarian substitute for meat and fish by Buddhist monks, especially in Zen Buddhism. Tofu
Tofu
sold in Haikou, Hainan, China
China

In China, tofu is traditionally used as a food offering when visiting the graves of deceased relatives. It is claimed that the spirits (or ghosts) have long lost their chins and jaws, so that only tofu is soft enough for them to eat. Before refrigeration was available in China, tofu was often only sold during wintertime, since tofu did not spoil as easily in cold weather. During the warmer months, any leftover tofu would be spoiled if left for more than a day. Chinese war hero Guan Yu used to be a tofu maker before he enlisted in the army. Chinese martial arts expert and hero Yim Wing-chun was a celebrated tofu maker in her village. ( Tofu
Tofu
as such plays a part in a 1994 movie about her life, Wing Chun .)

Tofu
Tofu
and its production technique were subsequently introduced into Korea
Korea
and then Japan
Japan
in the Nara period (late 8th century) as well as into other parts of East Asia
East Asia
. The earliest document concerning tofu in Japan
Japan
shows that the dish was served as an offering at the Kasuga Shrine in Nara in 1183. The book Tofu Hyakuchin (豆腐百珍 Dòufu Bǎizhēn), published in the Edo period
Edo period
, lists 100 recipes for cooking tofu.

The rise in acceptance of tofu likely coincided with that of Buddhism , as it is an important source of proteins in that religion's vegetarian diet. Since then, tofu has become a staple in many countries, including Vietnam
Vietnam
, Thailand
Thailand
, and Korea
Korea
, with subtle regional variations in production methods, texture, flavor, and usage.

In Southeast Asia, tofu was introduced to the region by Chinese immigrants from sea-faring Fujian provinces, evident from the fact that many countries in Southeast Asia
Southeast Asia
refer to tofu using the Min Nan Chinese pronunciations for either soft and firm tofu, or "tāu-hū" and "tāu-goan" respectively. In Indonesia
Indonesia
, Malaysia
Malaysia
, Singapore
Singapore
, Thailand
Thailand
and the Philippines
Philippines
, tofu is widely available and used in many local dishes. Tofu
Tofu
is called tahu in Indonesia, and Indonesian dishes such as tahu sumbat, taoge tahu, asinan , siomay and some curries are often add slices of tofu as an ingredient. In addition, tahu goreng , tahu isi and tahu sumedang are popular fried tofu snacks. Tofu
Tofu
is called tauhu in Malaysia
Malaysia
and Singapore. Malaysian and Singaporean Indians use tofu in their cuisine. such as in Indian mee goreng , rojak pasembor. The strait peranakan cuisine often uses tofu, such as in mee kari Penang and laksa . The makers of tofu in these countries were originally Chinese but tofu now is made also by non-Chinese. Indonesia, Thailand, Malaysia
Malaysia
and the Philippines
Philippines
are major producers of tofu and have plants located in many municipalities. However, Singapore
Singapore
imports its tofu from its neighboring country, Malaysia.

Tofu
Tofu
in the Philippines
Philippines
is essential to the daily diet, as taho , widely eaten as breakfast, or tokwa (a dry fried variation), which is a staple or alternative to meat in main meals and in numerous regional dishes. Tofu
Tofu
was introduced to the archipelago in the 10th to 13th centuries by Song Chinese mariners and merchants, along with many different foods which had become staples of the Philippine
Philippine
diet. The use and production of tofu were first limited to urban centers with influential Chinese minorities, such as Cebu or Tondo , but quickly spread to even remote native villages and islands, long before the Spanish arrival in the 17th century.

IN THE WEST

Benjamin Franklin
Benjamin Franklin
was the first American to mention tofu in a 1770 letter to John Bartram . Franklin, who discovered it during a trip to London, included a few soybeans and referred to it as "cheese" from China. The first tofu company in the United States was established in 1878. In 1908 Li Yuying , a Chinese anarchist and a vegetarian with a French degree in agriculture and biology, opened a soy factory, the Usine de la Caséo-Sojaïne , which was the world's first soy dairy and the first factory in France to manufacture and sell beancurd. However tofu was not well known to most Westerners before the middle of the 20th century. With increased cultural contact between the West and East Asia
East Asia
and growing interest in vegetarianism, knowledge of tofu has become widespread. Numerous types of pre-flavored tofu can be found in many supermarket chains throughout the West. It is also used by many vegans and vegetarians as a means to gain protein without consuming meat products.

PRODUCTION

tofu (soft, typical) NUTRITIONAL VALUE PER 100 G (3.5 OZ)

ENERGY 291 kJ (70 kcal)

CARBOHYDRATES 1.5 g

FAT 3.5 g

SATURATED 0.5 g

PROTEIN 8 g

MINERALS

CALCIUM (13%) 130 mg

IRON (8%) 1.10 mg

SODIUM (0%) 4 mg

* Units * μg = micrograms • mg = milligrams * IU = International units

Percentages are roughly approximated using US recommendations for adults. Source: USDA Nutrient Database

Regardless of the product or scale of the production, the production of tofu essentially consists of

* the preparation of soymilk * the coagulation of the soymilk to form curds * the pressing of the soybean curds to form tofu cakes.

The typical tofu making procedures are cleaning, soaking, grinding beans in water, filtering, boiling, coagulation, and pressing.

Coagulation of the protein and oil (emulsion ) suspended in the boiled soy milk is the most important step in the production of tofu. This process is accomplished with the aid of coagulants. In the case of salts, the positively charged ion in the particular salt reacts with the various protein in the milk causing the proteins to precipitate with the oil to form a curd. Coagulation of the soymilk is the most important step in tofu making process but is complicated as the process depends on complex interactions many variables including the variety and percentage of protein in the soybeans used, slurry cooking temperature, coagulation temperature, and more factors relating to the processing.

Two types of coagulants (salts and acids) are used commercially.

SALT COAGULANTS

* CALCIUM SULFATE (gypsum ): The traditional and most widely used coagulant to produce Chinese-style tofu, it produces a tofu that is tender but slightly brittle in texture. The coagulant itself has no perceivable taste. Also known as gypsum , calcium sulfate is quarried from geological deposits and no chemical processing or refining is needed, making it the cheapest coagulant used in tofu production. When used in production, the coagulation reaction is slower due to its low solubility, forming a smooth, more gelatinous network with relatively high water content and soft texture. Use of this coagulant also makes a tofu that is rich in calcium . As such, many tofu manufacturers choose to use this coagulant to be able to market their tofu as a good source of dietary calcium. * Chloride-type Nigari salts or Lushui ( Traditional: 鹵水, 滷水; Simplified: 卤水, lǔshuǐ) – Magnesium
Magnesium
chloride and calcium chloride : Both of these salts are highly soluble in water and affect soy protein in the same way, whereas gypsum is only very slightly soluble in water and acts differently in soy protein precipitation, the basis of tofu formation. These are the coagulants used to make tofu with a smooth and tender texture. In Japan, a white powder called nigari , which consists primarily of magnesium chloride, is produced from seawater after the sodium chloride is removed and the water evaporated. Depending on its production method, nigari/Lushui may also contain small quantities of magnesium sulfate (Epsom salt), potassium chloride , calcium chloride, and trace amounts of other naturally occurring salts. Although the term nigari is derived from nigai, the Japanese word for "bitter," neither nigari nor pure magnesium chloride imparts a perceivable taste to the finished tofu. Is not found in seawater, therefore not regarded as nigari but is used extensively in United States as it is the only coagulant that gives tofu addition of calcium as a mineral and due to its flavor and least expensive. Fresh clean seawater itself can also be used as a coagulant.

Red tofu

ACID COAGULANTS

* GLUCONO DELTA-LACTONE (GDL): A naturally occurring organic acid also used in cheese making , this coagulant produces a very fine textured tofu that is almost jelly-like. It is used especially for "silken" and softer tofus, and confers an almost imperceptible sour taste to the finished product. It is commonly used together with calcium sulfate to give soft tofu a smooth tender texture. * Other edible acids: Though they can affect the taste of the tofu more, and vary in density and texture, acids such as acetic acid (vinegar ) and citric acid (such as lemon juice), can also be used to coagulate soy milk and produce tofu.

ENZYME COAGULANTS

* Among enzymes that have been shown to produce tofu are papain , and alkaline and neutral proteases from microorganisms. In the case of papain, the enzyme-to-substrate ratio, by weight, was held constant at 1:400. An aliquot of 1% crude papain was added to "uncooked" soy milk at room temperature and heated to 90–100 °C (194–212 °F). Papain, moreover, has been studied as a gelling agent to produce "instant tofu" from soy protein isolate and soy glycinin (11S) protein.

Contemporary tofu manufacturers may choose to use one or more of these coagulants, since each plays a role in producing a desired texture in the finished tofu. Different textures result from different pore sizes and other microscopic features in tofu produced using each coagulant. The coagulant mixture is dissolved into water, and the solution is then stirred into boiled soy milk until the mixture curdles into a soft gel .

Coagulants are typically added at concentrations between 1.5 and 5.0 g/kg. In all coagulants consisting of calcium or magnesium salts, the positive double bonded ions of the calcium or magnesium are responsible for the coagulating soy proteins and become part of the tofu thereby enhancing it’s nutritional value. Only 1 part per 1000 of the tofu eaten is coagulant, most react with soy protein and are broken down into ions and the nonreactive portion dissolve in the whey and discarded. Tofu
Tofu
in a market ready for sale. This tofu is still between the wooden boards that were used to press out the water

The curds are processed differently depending on the form of tofu that is being manufactured. For soft silken tofu (嫩豆腐; nèn dòufu) or tofu flower (豆花, dòuhuā) the soy milk is curdled directly in the tofu's selling package. For standard firm Asian tofu, the soy curd is cut and strained of excess liquid using cheese cloth or muslin and then lightly pressed to produce a soft cake. Firmer tofus, such as Asian dry tofu (豆干) or Western types of tofu, are further pressed to remove even more liquid. In Vietnam, the curd is strained and molded in a square mold, and the end product is called đậu khuôn (molded bean) or đậu phụ (one of the Vietnamese ways to pronounce the Chinese dòufu). The tofu curds are allowed to cool and become firm. The finished tofu can then be cut into pieces, flavored or further processed.

Although tartness is sometimes desired in dessert tofu, the acid used in flavoring is usually not the primary coagulant, since concentration sufficiently high to induce coagulation negatively affects the flavor or texture of the resulting tofu. A sour taste in tofu and a slight cloudiness in its storing liquid is also usually an indication of bacterial growth and, hence, spoilage.

COLOUR

The whiteness of tofu is ultimately determined by the soybean variety, soybean protein composition and degree of aggregation of the tofu gel network. The yellowish beige color of soybeans is due to the color compounds including anthocyanin, isoflavones and polyphenol compounds therefore the soybean variety used can predict the color of the final tofu product. Ways to reduce the yellow color include reducing isoflavone content by changing the pH of the soymilk solution used in the production of tofu so that they precipitate out and are removed during the extraction of okara. The opacity of tofu gel and off-white color typical of standard uncooked firm tofu is due to the scattering of light by the colloidal particles of the tofu. The addition of higher levels of calcium salts and high protein content contributes to forming a denser and more aggregated gel network which disperses more light resulting a tofu with a whiter gel appearance.

Tofu
Tofu
is made by coagulating soy milk and pressing the resulting curds . Although pre-made soy milk may be used, some tofu producers make their own soy milk by soaking, grinding, boiling and straining dried (or, less commonly, fresh) soybeans .

Coagulation of the protein and oil (emulsion ) suspended in the boiled soy milk is the most important step in the production of tofu. This process is accomplished with the aid of coagulants. Two types of coagulants (salts and acids) are used commercially.

FLAVOUR

Tofu
Tofu
flavor is generally described as bland, however this taste is desired by customers in North America while a more beany-flavor is preferred in East Asia. The beany or bland taste is generated during the grinding and cooking unit process during production and either a “hot grind” or “cold grind” can be implemented to influence the taste in line with taste preference. The hot grind method reduces the beany flavor due to the inactivation of the lipoxygenase enzyme in soy protein that is known to generate off flavors to generate a tofu that is “bland” taste whereas the cold grind the enzyme is still present which produces the aldehyde, alcohol and ester volatile compounds that create to the beany notes of some tofu.

VARIETIES

A wide variety of tofu is available in both Western and Eastern markets. Despite the range of options, tofu products can be split into two main categories: 'fresh tofu', which is produced directly from soy milk , and 'processed tofu', which is produced from fresh tofu. Tofu production also creates important by-products that are used in various cuisines.

FRESH TOFU

Depending on the amount of water that is extracted from the tofu curds, fresh tofu can be divided into four main varieties: extra soft, soft (or silken), firm, and extra firm. Fresh tofu is usually sold completely immersed in water to maintain its moisture content.

Extra Soft Tofu

Extra soft tofu

KOREAN NAME

HANGUL 순두부

HANJA 순豆腐

LITERAL MEANING mild tofu

TRANSCRIPTIONS

REVISED ROMANIZATION sun-dubu

MCCUNE–REISCHAUER sun-tubu

Extra soft tofu, called sundubu (순두부; "mild tofu") in Korean , is softer than other types of tofu and is usually sold in tubes. It is the main ingredient in sundubu-jjigae (순두부찌개; "soft tofu stew"). Although sun in sundubu doesn't have Sino-Korean origin , sundubu is often translated into Chinese and Japanese using the Chinese character 純, whose Korean pronunciation is sun and the meaning is "pure". Thus in China, sundubu is called chún dòufu (純豆腐; "pure tofu"), and in Japan, it is called jun tōfu (純豆腐) or sundubu (スンドゥブ).

*

Sundubu (extra soft tofu) packed in a tube *

Boiled sundubu (extra soft tofu) in ttukbaegi

Soft Or Silken Tofu

Soft tofu

CHINESE NAME

CHINESE 嫩豆腐

LITERAL MEANING "soft tofu"

TRANSCRIPTIONS

STANDARD MANDARIN

HANYU PINYIN nèn-dòufu

WADE–GILES nên4-tou4fu

ALTERNATIVE CHINESE NAME

CHINESE 滑豆腐

LITERAL MEANING "smooth tofu"

TRANSCRIPTIONS

STANDARD MANDARIN

HANYU PINYIN huá-dòufu

WADE–GILES hua2-tou4fu

KOREAN NAME

HANGUL 연두부

HANJA 軟豆腐

LITERAL MEANING "soft tofu"

TRANSCRIPTIONS

REVISED ROMANIZATION yeon-dubu

MCCUNE–REISCHAUER yŏn-tubu

JAPANESE NAME

KANJI 絹漉し豆腐

KANA きぬごしどうふ

TRANSCRIPTIONS

REVISED HEPBURN kinugoshi-dōfu

Soft/silken tofu, called nèn dòufu (嫩豆腐; "soft tofu") or huá dòufu (滑豆腐, "smooth tofu") in Chinese , kinugoshi tōfu (絹漉し豆腐; "silk-filtered tofu") in Japanese , and yeondubu (연두부; 軟豆腐; "soft tofu") in Korean , is undrained, unpressed tofu that contains the high moisture content. Silken tofu is produced by coagulating soy milk without curdling it. Silken tofu is available in several consistencies, including "soft" and "firm", but all silken tofu is more delicate than regular firm tofu (pressed tofu) and it has different culinary uses. In Japan
Japan
and Korea, traditional soft tofu is made with seawater . Silken tofu is a versatile, reliable substitute for dairy products and eggs, especially for smoothies and baked desserts.

Douhua (豆花, dòuhuā or 豆腐花, dòufuhuā in Chinese), or tofu brain (豆腐腦 or 豆腐脑, dòufunaǒ in Chinese) is often eaten as a dessert, but sometimes salty pickles or hot sauce are added instead. This is a type of soft tofu with an even higher moisture content. Because it is very difficult to pick up with chopsticks , it is generally eaten with a spoon. With the addition of flavorings such as finely chopped spring onions , dried shrimp , soy sauce , or chilli sauce , douhua is a popular breakfast dish across China. In Malaysia, douhua is usually served warm with white or dark (palm) sugar syrup, or served cold with longans .

Some variation exists among soft tofus. Black douhua (黑豆花, hēidòuhuā) is a type of silken tofu made from black soybeans, which is usually made into dòuhuā (豆花) rather than firm or dry tofu. The texture of black bean tofu is slightly more gelatinous than regular douhua and the color is greyish in tone. This type of tofu is eaten for its earthy "black bean taste." Edamame
Edamame
tofu is a Japanese variety of kinugoshi tōfu made from edamame (fresh green soybeans); it is pale green in color and often studded with whole edamame.

*

Japanese-style "silken tofu" with soy sauce and a decorative carrot slice *

Chinese soft tofu dish, pidan doufu

Firm Tofu

Firm tofu

CHINESE NAME

CHINESE 老豆腐

LITERAL MEANING "old tofu"

TRANSCRIPTIONS

STANDARD MANDARIN

HANYU PINYIN lǎo-dòufu

WADE–GILES lao3-tou4fu

KOREAN NAME

HANGUL 모두부

HANJA 모豆腐

LITERAL MEANING "block tofu"

TRANSCRIPTIONS

REVISED ROMANIZATION mo-dubu

MCCUNE–REISCHAUER mo-tubu

JAPANESE NAME

KANJI 木綿豆腐

KANA もめんどうふ

TRANSCRIPTIONS

REVISED HEPBURN momen-dōfu

Firm tofu (called 老豆腐 lǎo dòufu in Chinese; 木綿豆腐, momen-dōfu in Japanese, "cotton tofu"; 모두부, modubu in Korean): Although drained and pressed, this form of fresh tofu still contains a great amount of moisture. It has the firmness of raw meat and bounces back readily when pressed. The texture of the inside of the tofu is similar to that of a firm custard. The skin of this form of tofu has the pattern of the muslin used to drain it and the outside is slightly more resistant to damage than the inside. It can be picked up easily with chopsticks.

In some places in Japan, a very firm type of momen-dōfu is eaten, called ishi-dōfu (石豆腐, "stone tofu") in parts of Ishikawa , or iwa-dōfu (岩豆腐, "rock tofu") in Gokayama in the Toyama Prefecture and in Iya in the prefecture of Tokushima
Tokushima
. Due to their firmness, some of these types of tofu can be tied by rope and carried. These types of firm tofu are produced with seawater instead of nigari (magnesium chloride ), or using concentrated soy milk . Some of them are squeezed to eliminate excess moisture by using heavy weights. These products are produced in areas where travelling is inconvenient, such as remote islands, mountain villages, and heavy snowfall areas.

*

Firm tofu *

Roasted modubu (firm tofu) with seasoned soy sauce

Extra Firm Tofu

Extra firm tofu

CHINESE NAME

CHINESE 豆干

LITERAL MEANING "dry tofu"

TRANSCRIPTIONS

STANDARD MANDARIN

HANYU PINYIN dòugān

WADE–GILES tou4kan1

KOREAN NAME

HANGUL 건두부

HANJA 乾豆腐

LITERAL MEANING "dry tofu"

TRANSCRIPTIONS

REVISED ROMANIZATION geon-dubu

MCCUNE–REISCHAUER kŏn-tubu

Dòu gān (豆干, literally "dry tofu" in Chinese) is an extra firm variety of tofu where a large amount of liquid has been pressed out. Dòu gān contains the least amount of moisture of all fresh tofu and has the firmness of fully cooked meat and a somewhat rubbery feel similar to that of paneer . When sliced thinly, this tofu can be crumbled easily. The skin of this form of tofu has the pattern of the muslin used to drain and press it. Western firm tofu is milled and reformed after pressing and sometimes lacks the skin with its cloth patterning. One variety of dried tofu is pressed especially flat and sliced into long strings with a cross section smaller than 2 mm × 2 mm. Shredded dried tofu (豆干絲, dòugānsī in Chinese, or simply 干絲, gānsī), which looks like loose cooked noodles , can be served cold, stir-fried, or similar in style to Japanese aburaage .

*

Dòufu gān (dried tofu) *

Prepared "dried" tofu threads (干絲, gānsī)

PROCESSED TOFU

Many forms of processed tofu exist, due to the varied ways in which fresh tofu can be used. Some of these techniques probably originate from the need to preserve tofu before the days of refrigeration, or to increase its shelf life and longevity. Other production techniques are employed to create tofus with unique textures and flavors.

Fermented

chòu dòufu is a very pungent type of tofu

* PICKLED TOFU (豆腐乳 in Chinese, pinyin : dòufurǔ, or 腐乳 fŭrŭ; chao in Vietnamese): Also called "preserved tofu" or "fermented tofu", consists of cubes of dried tofu that have been allowed to fully air-dry under hay and slowly ferment with the help of aerial bacteria. The dry fermented tofu is then soaked in salt water, Chinese wine, vinegar, and minced chiles , or in a unique mixture of whole rice, bean paste, and soybeans. In the case of red pickled tofu (紅豆腐乳 in Chinese, Pinyin: hóng dòufurǔ), red yeast rice (cultivated with Monascus purpureus ) is added for color. In Japan, pickled tofu with miso paste is called "tofu no misodzuke," which is a traditional preserved food in Kumamoto . In Okinawa
Okinawa
, pickled and fermented tofu is called "tofuyo"(豆腐餻). It is made from "Shima-doufu" (an Okinawan variety of large and firm tofu). It is fermented and matured with koji mold, red koji mold, and awamori . * STINKY TOFU (臭豆腐 in Chinese, Pinyin: chòudòufu): A soft tofu that has been fermented in a unique vegetable and fish brine. The blocks of tofu smell strongly of certain pungent cheeses, or even rotten food. Despite its strong odor, the flavor and texture of stinky tofu is appreciated by aficionados, who describe it as delightful. The texture of this tofu is similar to the soft Asian tofu from which it is made. The rind that stinky tofu develops from frying is said to be especially crisp, and is usually served with soy sauce , sweet sauce, or hot sauce.

Dried Tofu

Two kinds of dried tofu are produced in Japan. They are usually rehydrated by being soaked in water prior to consumption. In their dehydrated state they do not require refrigeration.

* Koya tofu (also known as shimidofu) is made using nigari . * Kori tofu (literally "frozen tofu") is freeze-dried .

Fried

Ganmodoki
Ganmodoki
(がんもどき)

* With the exception of the softest tofus, all forms of tofu can be fried. Thin and soft varieties of tofu are deep fried in oil until they are light and airy in their core 豆泡 dòupào, 豆腐泡 dòufupào, 油豆腐 yóudòufu, or 豆卜 dòubǔ in Chinese, literally "bean bubble," describing the shape of the fried tofu as a bubble. * Tofus such as firm Asian and dòu gān (Chinese dry tofu), with their lower moisture content, are cut into bite-sized cubes or triangles and deep fried until they develop a golden-brown, crispy surface (炸豆腐 in Chinese, zhádòufu, lit. "fried tofu"). These may be eaten on their own or with a light sauce, or further cooked in liquids; they are also added to hot pot dishes or included as part of the vegetarian dish called luohan zhai . This deep fried tofu is also called Atsuage (厚揚げ) or Namaage (生揚げ) in Japan. The thinner variety, called Aburaage (油揚げ), develops a tofu pouch often used for Inari-sushi .

Frozen

Thawed and sliced frozen tofu

* THOUSAND LAYER TOFU (千葉豆腐, qiānyè dòufu, literally "thousand layer tofu," or 凍豆腐 dòngdòufu, 冰豆腐 bīngdòufu in Chinese, both meaning "frozen tofu"): When tofu is frozen, the large ice crystals that develop within it result in the formation of large cavities that appear to be layered. Frozen tofu takes on a yellowish hue in the freezing process. Thousand layer tofu is commonly made at home from Asian soft tofu, although it is also commercially sold as a specialty in parts of Taiwan. This tofu is defrosted and sometimes pressed to remove moisture prior to use.

Koya-dofu after soaking in water.

* KOYA-DOFU (kōya-dōfu, 高野豆腐 in Japanese): The name comes from Mount Kōya , a center of Japanese Buddhism
Buddhism
famed for its shōjin ryōri , or traditional Buddhist vegetarian cuisine. It is sold in freeze-dried blocks or cubes in Japanese markets. Since it is dried, it can be preserved long term. It must be soaked in water before eating, and is typically simmered in dashi , sake or mirin and soy sauce . In shōjin ryōri, vegetarian kombu dashi, made from seaweed, is used. When prepared in the usual manner, it has a spongy texture and mildly sweet or savory flavor (the taste and flavor depending on what soup or cooking stock it was simmered in). A similar form of freeze-dried tofu, in smaller pieces, is found in instant soups (such as miso soup ), in which the toppings are freeze-dried and stored in sealed pouches.

BY-PRODUCTS OF TOFU PRODUCTION

Tofu
Tofu
production creates some edible by-products. Food products are made from the protein-oil film or "skin" that forms over the surface of boiling soy milk in an open shallow pan. The solids leftover from pressing soy milk are called okara .

Tofu
Tofu
Skin

Tofu skin is commonly sold in the form of dried leaves or sheets

Tofu skin is produced when soy milk is boiled in an open, shallow pan, thus producing a film or skin composed primarily of a soy protein-lipid complex on the liquid surface. The films are collected and dried into yellowish sheets known as SOY MILK SKIN (腐皮, fǔpí in Chinese; 湯葉, yuba in Japanese). Its approximate composition is: 50–55% protein, 24–26% lipids (fat), 12% carbohydrate, 3% ash, and 9% moisture.

The skin can also be bunched up into a stick form and dried into a product known as "tofu bamboo" (腐竹, fǔ zhú in Chinese; phù trúc in Vietnamese; kusatake, Japanese), or into myriad other forms. Since tofu skin has a soft yet rubbery texture, it is folded or shaped into different forms and cooked further to imitate meat in vegan cuisine.

Some factories dedicate their production to tofu skin and other soy membrane products.

Okara

Main article: Okara (food)
Okara (food)

Okara (from the Japanese , おから, okara; known as 雪花菜, xuěhuācài, in Chinese , lit. "snowflake vegetable"; 豆腐渣, dòufuzhā, also Chinese , lit. "tofu sediment/residue"; and 콩비지, kongbiji, in Korean ), is a tofu by-product sometimes known in the west as "soy pulp" or "tofu lees", consisting of the fiber, protein, and starch left over when soy milk has been extracted from ground soaked soybeans. Although it is mainly used as animal feed in most tofu producing cultures, it is sometimes used in Japanese and Korean cuisines, such as in the Korean stew kongbiji jjigae (콩비지찌개). It is also an ingredient for the vegetarian burgers produced in many Western nations.

OTHER TOFUS

Due to their Asian origins and their textures, many food items are called "tofu" even though their production processes are not technically similar. For instance, many sweet almond tofus are actually gelatinous desserts hardened using agar or gelatin . Some foods, such as Burmese tofu, are not coagulated from the "milk" of the legume but rather set in a manner similar to soft polenta , Korean muk , or the jidou liangfen of Yunnan
Yunnan
province of Southwest China
China
.

Sweets

Almond "tofu", which is not made of soy milk but rather from gelatin or agarose

" Almond tofu " (Chinese: 杏仁豆腐 xìngrén dòufu; Japanese: annindōfu) is a milky white and gelatinous resembling tofu, but it does not use soy products or soy milk and is hardened with agar . A similar dessert made with coconut milk or mango juices may occasionally be referred to as "coconut tofu" or "mango tofu", although such names are also given to hot dishes that use soy tofu and coconut or mango in the recipe.

Egg Tofu

Egg tofu (ja) (Japanese: 玉子豆腐, 卵豆腐, tamagodōfu) (Chinese: 蛋豆腐, dàn dòufu; often called 日本豆腐, rìbĕn dòufu, lit. " Japan
Japan
bean curd") is the main type of savory flavored tofu. Whole beaten eggs are combined with dashi , poured into molds, and cooked in a steamer (cf. chawanmushi ). This tofu has a pale golden color that can be attributed to the addition of eggs and, occasionally, food coloring. This tofu has a fuller texture and flavor than silken tofu, which can be attributed to the presence of egg fat and protein. Plain "dried tofu" can be flavored by stewing in soy sauce (滷) to make soy-sauce tofu. It is quite common to see tofu sold in market in this soy-sauce stewed form.

Sesame
Sesame
Tofu

The tofu known as goma-dōfu (ja) is made by grinding sesame into a smooth paste, combining it with liquid and kudzu starch, and heating it until curdling occurs. It is often served chilled as hiyayakko .

Peanut
Peanut
Tofu

In Okinawa, Japan, jīmāmi-dōfu (ja) is made in a process similar to that used for sesame tofu. A peanut milk (made by crushing raw peanuts, adding water and straining) is combined with starch (usually sweet potato known locally as umukuji or umukashi (芋澱粉)) and heated until curdling occurs.

The Chinese equivalent is 落花生豆腐 luòhuāshēng dòufu.

Burmese Tofu

Main article: Burmese tofu To hpu (Burmese tofu), in two forms: fresh and fritters

Burmese tofu (to hpu in Burmese ) is a legume product made from besan (chana dal ) flour; the Shan variety uses yellow split pea flour instead. Both types are yellow in color and generally found only in Myanmar
Myanmar
, though the Burman variety is also available in some overseas restaurants serving Burmese cuisine . Burmese tofu may be fried as fritters cut into rectangular or triangular shapes.

A variety called hsan to hpu (or hsan ta hpo in Shan regions) is made from rice flour (called hsan hmont or mont hmont) and is white in color with the same consistency as yellow Burmese tofu when set. It is eaten as a salad in the same manner as yellow tofu.

PREPARATION

Tofu
Tofu
has very little flavor or smell of its own. Consequently, tofu can be prepared either in savory or sweet dishes, acting as a bland background for presenting the flavors of the other ingredients used. As a method of flavoring it is often marinated in soy sauce, chilis, sesame oil, etc.

EASTERN METHODS

In Asian cooking, tofu is eaten in a myriad of ways, including raw, stewed, stir-fried, in soup, cooked in sauce, or stuffed with fillings. The idea of using tofu as a meat substitute is not common in East Asia. Many Chinese tofu dishes such as jiācháng dòufu (家常豆腐) and mápó dòufú ( 麻婆豆腐 ) include meat.

Lightly Flavored

In Japan
Japan
, a common lunch in the summer months is hiyayakko (冷奴), silken or firm Asian tofu served with freshly grated ginger , green onions , or katsuobushi shavings with soy sauce . In the winter, tofu is frequently eaten as "yudofu," which is simmered in a clay pot with vegetables (ex:chinese cabbage , green onion, etc.) using konbu dashi . Douhua (豆花), is a soft tofu dish. The fresh tofu is served warm and dressed with sweet syrup. Lamma Island , Hong Kong
Hong Kong
.

In Chinese cuisine
Chinese cuisine
, Dòuhuā (豆花) is served with toppings such as boiled peanuts , azuki beans , cooked oatmeal , tapioca , mung beans , or a syrup flavored with ginger or almond . During the summer, "dòuhuā" is served with crushed ice; in the winter, it is served warm. In many parts of China
China
, fresh tofu is eaten with soy sauce or further flavored with katsuobushi shavings, century eggs (皮蛋 pídàn), and sesame seed oil.

In Korean cuisine
Korean cuisine
, dubu gui (두부구이) consists of pan fried cubes of firm tofu seasoned with soy sauce, garlic, and other ingredients. Cubes of cold, uncooked firm tofu seasoned with soy sauce, scallions, and ginger, prepared in a manner similar to the Japanese hiyayakko, are also enjoyed. The popular bar food, or anju (안주), called dubu kimchi (두부김치), features boiled, firm tofu served in rectangular slices around the edges of a plate with pan fried, sautéed or freshly mixed kimchi (김치) in the middle.

In the Philippines
Philippines
, the sweet delicacy taho is made of fresh tofu with brown sugar syrup and sago . The Singaporean version of taho or douhua is called tofufa. Warm soft tofu is served in slices (created by scooping it from a wooden bucket with a flat spoon) in a bowl with either pandan-flavored sugar syrup or palm sugar syrup.

In Vietnam, dòuhuā, pronounced đậu hủ, is a variety of soft tofu made and carried around in an earthenware jar. It is served by being scooped into a bowl with a very shallow and flat spoon, and it is eaten together with either powdered sugar and lime juice or a ginger-flavored syrup. It is generally eaten hot, also in summer.

Fried

Fried tofu in Indonesia
Indonesia

A common cooking technique in many parts of East and Southeast Asia involves deep frying tofu in vegetable oil , sunflower oil, or canola oil with varied results. In Indonesia, it is usually fried in palm oil . Although tofu is often sold preprocessed into fried items, pre-fried tofu is seldom eaten directly and requires additional cooking. Depending on the type of tofu used, the texture of deep fried tofu may range from crispy on the outside and custardy on the inside, to puffed up like a plain doughnut . The former is usually eaten plain in Chinese cuisine
Chinese cuisine
with garlic soy sauce, while the latter is either stuffed with fish paste to make Yong Tau Foo or cooked in soups. In Taiwan
Taiwan
, fried tofu is made into a dish called " A-gei ", which consists of a fried aburage tofu package stuffed with noodles and capped with surimi .

In Japan, cubes of lightly coated and fried tofu topped with a kombu dashi -based sauce are called agedashi-dofu (揚げ出し豆腐). Soft tofu that has been thinly sliced and deep fried, known as aburage in Japan
Japan
and yubu (유부) in Korea, is commonly blanched , seasoned with soy sauce and mirin and served in dishes such as kitsune udon . Aburage is sometimes also cut open to form a pocket and stuffed with sushi rice; this dish is called inarizushi (稲荷寿司) and is also popular in Korea, where it is called yubu chobap (유부초밥). In Indonesia
Indonesia
, tofu is called tahu, and the popular fried tofu is tahu goreng , tahu isi or tahu sumedang .

Soups, Stews, And Braised Dishes

Yudofu, or tofu in hot water

A spicy Sichuan preparation using firm Asian tofu is mápó dòufu (麻婆豆腐). It involves braised tofu in a beef , chili, and fermented bean paste sauce. A vegetarian version is known as málà dòufu (麻辣豆腐).

Dried tofu is usually not eaten raw but first stewed in a mixture of soy sauce and spices. Some types of dried tofu are pre-seasoned with special blends of spices, so that the tofu may either be called "five spice tofu" (五香豆腐 wǔxiāng dòufu) or "soy sauce stewed tofu" (鹵水豆腐 lǔshuǐ dòufu). Dried tofu is typically served thinly sliced with chopped green onions or with slices of meat for added flavor. Most dried tofu is sold after it has been fried or pre-stewed by tofu vendors.

Soft tofu can also be broken up or mashed and mixed with raw ingredients prior to being cooked. For example, Japanese ganmodoki is a mixture of chopped vegetables and mashed tofu. The mixture is bound together with starch and deep fried. Chinese families sometimes make a steamed meatloaf or meatball dish from equal parts of coarsely mashed tofu and ground pork. In India, tofu is also used as a low fat replacement for paneer , providing the same texture with similar taste.

Tofu
Tofu
bamboos are often used in lamb stew or in a dessert soup . Tofu skins are often used as wrappers in dim sum . Freeze-dried tofu and frozen tofu are rehydrated and enjoyed in savory soups. These products are often taken along on camping trips since a small bag of them can provide protein for many days.

Japanese 'miso soup ', stocks with miso paste , is frequently made with tofu.

In Korean cuisine
Korean cuisine
, soft tofu, called sundubu (순두부), is used to make a thick stew called sundubu jjigae (순두부 찌개). Firm, diced tofu often features in the staple stews doenjang jjigae (된장 찌개) and kimchi jjigae (김치 찌개).

Smoked

Smoked tofu at The House of Confucius in Qufu
Qufu

At Qufu
Qufu
, the home town of Confucius, smoked tofu is a popular dish.

Bacem

Bacem is a method of cooking tofu originating in Java
Java
, Indonesia
Indonesia
. The tofu is boiled in coconut water, mixed with lengkuas (galangal), Indonesian bay leaves, coriander , shallot , garlic , tamarind and palm sugar . After the spicy coconut water has completely evaporated, the tofu is fried until it is golden brown. The result is sweet, spicy, and crisp. This cooked tofu variant is commonly known as tahu bacem in Indonesian . Tahu bacem is commonly prepared along with tempeh and chicken .

As Flavoring

Pickled tofu is commonly used in small amounts together with its soaking liquid to flavor stir-fried or braised vegetable dishes (particularly leafy green vegetables like water spinach ). It is often eaten directly as a condiment with rice or congee .

WESTERN METHODS

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Generally, the firmer styles of tofu are used for kebabs , mock meats, and dishes requiring a consistency that holds together, while the softer styles can be used for desserts, soups, shakes, and sauces.

Firm Western tofu types can be barbecued, since they hold together on a barbecue grill. These types are usually marinated overnight as the marinade does not easily penetrate the entire block of tofu (techniques to increase penetration of marinades are stabbing repeatedly with a fork or freezing and thawing prior to marinating). Grated firm Western tofu is sometimes used in conjunction with TVP as a meat substitute. Softer tofus are sometimes used as a dairy-free or low-calorie filler. Silken tofu may be used to replace cheese in certain dishes (such as lasagna ).

Tofu
Tofu
has also been fused into other cuisines in the West, for instance in Indian-style curries.

Tofu
Tofu
and soy protein can be industrially processed to match the textures and flavors of cheese , pudding , eggs , bacon , and similar products. Tofu's texture can also be altered by freezing , puréeing , and cooking . In the Americas , Europe
Europe
, Australia
Australia
and New Zealand
New Zealand
, tofu is frequently associated with vegetarianism and veganism as it is a source of non-animal protein.

NUTRITION AND HEALTH

TRADITIONAL CHINESE MEDICINE CLAIMS

Tofu
Tofu
is considered a cooling agent in traditional Chinese medicine. It is claimed to invigorate the spleen, replenish qi , moisten and cool off Yang vacuity, and detoxify the body. However, there is no scientific evidence supporting such claims, nor their implied notions.

FUNCTIONS

In Chinese traditional medicine, tofu is considered suitable for those who are weak, malnourished, deficient in blood and qi; for the elderly and slim; for those with high fat content in blood, high cholesterol, overweight, and with hardened blood vessels; for people with diabetes; for mothers with low breast milk supply; for children and young adults; for those with an inflamed respiratory tract, phlegm, coughing or asthma. Tofu
Tofu
is also suited for people of old age; it is recommended that it be eaten together with liquor, since tofu contains cysteine, which can speed up the detoxification of alcohol in the body and lessen the harm done to the liver.

PROTEIN

Tofu
Tofu
is relatively high in protein , about 10.7% for firm tofu and 5.3% for soft "silken" tofu, with about 5% and 2% fat, respectively. as a percentage of weight.

In 1995, a report from the University of Kentucky , financed by Solae , concluded that soy protein is correlated with significant decreases in serum cholesterol, Low Density Lipoprotein LDL
LDL
(″bad cholesterol″) and triglyceride concentrations. However, High Density Lipoprotein HDL (″good cholesterol″) did not increase. Soy phytoestrogens (isoflavones : genistein and daidzein) absorbed onto the soy protein were suggested as the agent reducing serum cholesterol levels. On the basis of this research, PTI, in 1998, filed a petition with Food and Drug Administration
Food and Drug Administration
for a health claim that soy protein may reduce cholesterol and the risk of heart disease.

The FDA granted this health claim for soy: "25 grams of soy protein a day, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease." For reference, 100 grams of firm tofu coagulated with calcium sulfate contains 8.19 grams of soy protein. In January 2006, an American Heart Association review (in the journal Circulation) of a decade-long study of soy protein benefits showed only a minimal decrease in cholesterol levels, but it compared favorably against animal protein sources.

ALLERGIES

Because it is made of soy, individuals with allergies, particularly those allergic to legumes , should not consume tofu.

CHEMISTRY OF TOFU

All waters especially surface waters contain both dissolved and suspended particles. Coagulation and flocculation processes are used to separate the suspended solid portion from the water to form the curds which makes tofu. The suspended particles vary considerable in source, composition, and charge, particle size, shape and density. This affects the shape, firmness, and texture of the curds. The small particles are stabilized or kept in suspension by action of the physical forces on the particle themselves. One of the forces that play a dominant role in the stabilization results from the surface charge present on the particles. Most solids suspended in water present a negative charge and since they have the same type of surface charge, the particles repel each other when they come close together therefore they will remain in suspension rather than clump together and settle out of the water.

Tofu
Tofu
is made from soymilk which is a turbid colloidal liquid/solution. Turbid means a cloudy opaque or thick liquid with suspended matter. A colloid solution is a solution in which a material is evenly suspended in a liquid, in other words a colloid is a microscopically small substance this is equally dispersed throughout another material. Tofu
Tofu
structure is related to soymilk components particularly colloid components such as protein particles and oil globules. Protein
Protein
particles content increases with the increase of globulin ratio in soybeans. Tofu
Tofu
is made from the soybean mixture having different ratios by adding coagulant at various concentrations.

GELATION OF TOFU

PROTEINS

The two main fractions of the soybean important in tofu making are the 11S component, containing glycinin and the 7S subunit, containing hemagglutinins, lipoxygenases, b-amylase, and β-conglycinin. The major soy protein components, in the two fractions that make up 65-85% of the proteins in soybeans include glycinin and β-conglycinin. The soybean protein consists of many different subunits which are sensitive to heat, pH and ionic strength and become unevenly distributed among soluble and particulate fractions due to hydrophilic and hydrophobic interaction due to the amino acid composition.

Denaturation Of Glycinin And Β-conglycinin

Tofu
Tofu
is prepared by changing the nature of native soy proteins (Glycinin and β-conglycinin) in soy milk to form a gel. In the tofu making process, the denaturation of soy proteins happens during the heating processing unit where soy milk is steamed to 75-95 degrees C. The soy protein enthalpies of denaturation range from 0.2 to 3.0 J/gram protein for 7S fraction containing β-conglycinin and from 0.2 to 6.0 J/gram protein for 11S fraction including glycinin. Upon denaturation, β-conglycinin and conglycinin unfold and expose the hydrophobic acidic amino acid side chains to promote protein aggregation.

SOYMILK PARTICLE COMPOSITION (COOKING)

When talking about the particles in soymilk, researchers commonly refer to the particles in the soymilk system based on particle size and fractionation. The precipitated fraction refers to particulate protein particles that are >40 nm in size, the supernatant fraction contains soluble proteins

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