Rice vinegar is a vinegar made from rice wine in East Asia (China, Japan and Korea), as well as in Vietnam in Southeast Asia. It is used as a seasoning, dressing, and dipping in many dishes, including sushi, jiaozi, and . Some of its variants are also a drink by themselves.
Black vinegar is very popular in southern China. Chinkiang vinegar, which originated in the city of Zhenjiang (p=Zhènjiāng xiāngcù) in the eastern coastal province of Jiangsu, is considered a great one. Baoning vinegar (保寧醋 or 保宁醋) from Sichuan is another famous example. Typically, black rice vinegar is made with black glutinous rice (also called "sweet rice"), although millet or sorghum may be used instead. It is dark in color, and has a deep, almost smoky flavor. In addition to Zhenjiang, it is also produced in Hong Kong. This is different from the black vinegar popular in north China, which is made from sorghum, peas, barley, bran, and chaff and is most associated with Shanxi province.
Red rice vinegar has a distinctive red color from red yeast rice (红曲米), which is cultivated with the mold Monascus purpureus. This vinegar has a distinctive flavor of its own due to the red mold.
In Chinese cookbooks, ½ tablespoon of Western distilled white vinegar is stated to be equivalent in strength to 1 tablespoon Chinkiang vinegar, and recipes which call for 4 teaspoons of red rice vinegar could be substituted with only 3 teaspoons of white vinegar.Congee, Rice Noodles, Noodles, and Rice, by Mrs Lee Tsang Pang Chin, Publications (Holdings) Limited, Hong Kong, 1989.
Seasoned rice vinegar ( awasezu) is made by adding sake, salt and sugar. Additionally, mirin is also sometimes used (but only rarely). Although it can be made at home, prepared awasezu can also be readily bought at supermarkets. Seasoned rice vinegar is added to cooked rice to be used in making sushi. It is also used in salad dressing varieties popular in the west, such as Ginger dressing.
Traditionally, Edomae-style sushi used to be seasoned with a type of red rice vinegar known as akazu (赤酢). This is made using sake lees which would be stored in wooden boxes and aged for up to 20 years. After aging, the now black sake lees are mixed with water to form a mash known as Moromi (もろみ/醪). This mash is constantly turned and compressed before undergoing acetic acid fermentation.
A somewhat lighter form of black vinegar called kurozu (黒酢), made from rice, is produced in Japan. It is considered as a healthy drink; its manufacturers claim that it contains high concentrations of . Recent scientific research on kurozu has revealed its anti-cancer properties in vivo on rats and in vitro on human cancer cells.
Another rice vinegar is the lightly sour hèm, used in ốc bươu hấp hèm and gà hấp hèm which is a specialty of Hóc Môn district, Ho Chi Minh City. The mẻ rice vinegar, which is strongly sour, is used in trâu luộc mẻ—-a speciality of Cần Thơ city.
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