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Pickling

Procedure of preserving food in brine or vinegar

  • 18 min read
  • 4 chapters
Pickled gherkins and onions in a chip shop on Holloway Rd, Holloway, London.
Liz Sullivan · CC BY-SA 4.0

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Through Food preservation, Food and Vegetable

Pickling solutions are typically highly acidic, with a pH of 4.6 or lower, and high in salt, preventing enzymes from working and micro-organisms from multiplying. Pickling can preserve perishable foods for months, or in some cases years. Antimicrobial herbs and spices, such as mustard seed, garlic, cinnamon or cloves, are often added. If the food contains sufficient moisture, a pickling brine may be produced simply by adding dry salt. For example, sour cabbage, sauerkraut, and kimchi are produced by salting the vegetables to draw out excess water. Natural fermentation at room temperature, by lactic acid bacteria, produces the required acidity. Other pickles are made by placing vegetables in vinegar. Unlike the canning process, pickling (which includes fermentation) does not require that the food be completely sterile. The acidity or salinity of the solution, the temperature of fermentation, and the exclusion of oxygen determine which microorganisms dominate, and determine the flavor of the end product.

When both salt concentration and temperature are low, Leuconostoc mesenteroides dominates, producing a mix of acids, alcohol, and aroma compounds. At higher temperatures Lactobacillus plantarum dominates, which produces primarily lactic acid. Many pickles start with Leuconostoc, and change to Lactobacillus with higher acidity.

History

Ancient history

Pickling with vinegar likely originated in ancient Persia and Mesopotamia around 2400 BCE. There is archaeological evidence of cucumbers being pickled in the Tigris Valley in 2030 BCE. Pickling vegetables in vinegar continued developing in the Middle East region before spreading to the Maghreb, Sicily, and Spain. From Spain, it spread to the Americas. Fermented salt pickling reportedly originated in China.

Textual and archaeological evidence shows that food preservation by salting and pickling was practiced in the Greek and Roman world.

Age of Exploration

Pickling was used as a way to preserve food for out-of-season use and for long journeys, especially by sea. Salt pork and salt beef were common staples for sailors before the days of steam engines. Although the process was invented to preserve foods, pickles are also made and eaten because people enjoy the resulting flavors. Pickling may also improve the nutritional value of food by introducing B vitamins produced by bacteria.

Etymology

The English term "pickle" first appears around 1400 CE. It originates from the Middle English pikel, a spicy sauce served with meat or fish, borrowed from Middle Dutch or Middle Low German pekel ("brine") but later referred to preserving in brine or vinegar.

The Persian term "torshi" (Persian: ترشی) applies to pickled vegetables in many Middle Eastern, Caucasian, Slavic, and Balkan cuisines. The term is ultimately derived from Persian torsh 'sour' (Persian: ترش). This Persian word is borrowed with minor variants in many languages: Kurdish ترشى Tirşîn, tirşî, trshin; Turkish and Azerbaijani turşu; Greek: τουρσί, romanized: toursí; Bosnian, Croatian, Montenegrin, Serbian, Macedonian, Bulgarian turšija/туршија/туршия turshiya; Albanian: turshi; Judeo-Spanish trushí.

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