Souring is a food preparation technique that causes a physical and chemical change in food by exposing it to an

acid In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a se ...

. This acid can be added explicitly (e.g.,

vinegar Vinegar is an aqueous solution of acetic acid and trace compounds that may include flavorings. Vinegar typically contains 5–8% acetic acid by volume. Usually, the acetic acid is produced by a double fermentation, converting simple sugars to eth ...

lemon juice The lemon (''Citrus limon'') is a species of small evergreen trees in the flowering plant family Rutaceae, native to Asia, primarily Northeast India (Assam), Northern Myanmar or China. The tree's ellipsoidal yellow fruit is used for culina ...

, lime juice, etc.), or can be produced within the food itself by a

microbe A microorganism, or microbe,, ''mikros'', "small") and ''organism'' from the el, ὀργανισμός, ''organismós'', "organism"). It is usually written as a single word but is sometimes hyphenated (''micro-organism''), especially in olde ...

, such as ''

Lactobacillus ''Lactobacillus'' is a genus of Gram-positive, aerotolerant anaerobes or microaerophilic, rod-shaped, non-spore-forming bacteria. Until 2020, the genus ''Lactobacillus'' comprised over 260 phylogenetically, ecologically, and metabolically div ...

''. Souring is similar to

pickling Pickling is the process of preserving or extending the shelf life of food by either anaerobic fermentation in brine or immersion in vinegar. The pickling procedure typically affects the food's texture and flavor. The resulting food is cal ...

fermentation Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. In biochemistry, it is narrowly defined as the extraction of energy from carbohydrates in the absence of oxygen. In food p ...

, but souring typically occurs in minutes or hours, while pickling and fermentation can take a much longer amount of time.

Examples

Dairy A dairy is a business enterprise established for the harvesting or processing (or both) of animal milk – mostly from cows or buffaloes, but also from goats, sheep, horses, or camels – for human consumption. A dairy is typically located on ...

products produced by souring include:

Clabber Clabber is a four-player trick-taking card game played in southwestern Indiana near Evansville. Clabber is a member of the Jack-Nine family of trick-taking card games that are popular in Europe. The game is a four player variation similar to tha ...

Cheese Cheese is a dairy product produced in wide ranges of flavors, textures, and forms by coagulation of the milk protein casein. It comprises proteins and fat from milk, usually the milk of cows, buffalo, goats, or sheep. During productio ...

, ''

Crème fraîche Crème fraîche (English pronunciation: , , lit. "fresh cream") is a dairy product, a soured cream containing 10–45% butterfat, with a pH of approximately 4.5., p. 181''f'' It is soured with a bacterial culture. European labeling regulati ...

'', Cultured buttermilk,

Curd Curd is obtained by coagulating milk in a sequential process called curdling. It can be a final dairy product or the first stage in cheesemaking. The coagulation can be caused by adding rennet or any edible acidic substance such as l ...

, ''

Filmjölk (), also known as , is a traditional fermented milk product from Sweden, and a common dairy product within the Nordic countries. It is made by fermenting cow's milk with a variety of bacteria from the species ''Lactococcus lactis'' and ''Leucono ...

'', ''

Kefir Kefir ( ; also spelled as kephir or kefier; ; ; ) is a fermented milk drink similar to a thin yogurt or ayran that is made from kefir grains, a specific type of mesophilic symbiotic culture. The drink originated in the North Caucasus, in p ...

'', ''

Paneer Paneer (), also known as ponir () is a fresh acid-set cheese common in the Indian subcontinent (Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka) made from full-fat buffalo milk or cow milk. It is a non-aged, non-melting sof ...

'', ''Smetana'',

Soured milk Soured milk denotes a range of food products produced by the acidification of milk. Acidification, which gives the milk a tart taste, is achieved either through bacterial fermentation or through the addition of an acid, such as lemon juice or vin ...

Sour cream Sour cream (in North American English, Australian English and New Zealand English) or soured cream (British English) is a dairy product obtained by fermenting regular cream with certain kinds of lactic acid bacteria. The bacterial cultu ...

, and

Yogurt Yogurt (; , from tr, yoğurt, also spelled yoghurt, yogourt or yoghourt) is a food produced by bacterial fermentation of milk. The bacteria used to make yogurt are known as ''yogurt cultures''. Fermentation of sugars in the milk by these bac ...

Grain A grain is a small, hard, dry fruit ( caryopsis) – with or without an attached hull layer – harvested for human or animal consumption. A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and legum ...

products include:

Idli Idli or idly () is a type of savoury rice cake, originating from the South India,popular as breakfast foods in Southern India and in Sri Lanka. The cakes are made by steaming a batter consisting of fermented black lentils (de-husked) and ric ...

Sourdough Sourdough or sourdough bread is a bread made by the fermentation of dough using wild lactobacillaceae and yeast. Lactic acid from fermentation imparts a sour taste and improves keeping qualities. History In the ''Encyclopedia of Food Microbio ...

, and Sour mash. Others foods produced by souring include: ''

Ceviche Ceviche () is a Peruvian dish typically made from fresh raw fish cured in fresh citrus juices, most commonly lime or lemon. It is also spiced with '' ají'', chili peppers or other seasonings, and julienned red onions, salt, and cilantro are ...

'', ''

Kinilaw ''Kinilaw'' ( or , literally "eaten raw") is a raw seafood dish and preparation method native to the Philippines. It is also referred to as Philippine ceviche due to its similarity to the Latin American dish ceviche. It is more accurately a co ...

'', and

Key lime pie Key lime pie is an American dessert pie. It is made of lime, egg yolks, and sweetened condensed milk. It may be served with no topping, topped with a meringue topping made from egg whites, or with whipped cream; it may be cooked in a pie crust ...

.Key Lime Pie
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References

External links

Buttermilk substitution

Free lactic acid in sour milk

A comparison of sourdough microflora

{{Cooking techniques Cooking techniques Fermentation in food processing Culinary terminology

Examples

See also

References

External links