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Curds are a dairy product obtained by curdling (coagulating) milk. The coagulation can be caused by adding rennet or any edible acidic substance such as lemon juice or vinegar, and then allowing it to set. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. Milk that has been left to sour (raw milk alone or pasteurized milk with added lactic acid bacteria) will also naturally produce curds, and sour milk cheeses are produced this way. Producing cheese curds is one of the first steps in cheesemaking, the curds are pressed and drained to varying amounts for different styles of cheese and different secondary agents (molds for blue cheeses, etc.) are introduced before the desired aging finishes the cheese. The remaining liquid, which contains only whey proteins, is the whey. In cow's milk, 80% of the proteins are caseins.
In the Indian subcontinent, the words "curd" or "curds" are used to refer to "yogurt". In the Indian subcontinent, another word "paneer" is used to denote a dairy product discussed in this article.
Curd products vary by region and include cottage cheese, curd cheese (both curdled by bacteria and sometimes also rennet), farmer cheese, pot cheese, queso blanco, and Indian paneer (milk curdled with lime juice). The word can also refer to a non-dairy substance of similar appearance or consistency, though in these cases a modifier or the word curdled is generally used.
In England, curds produced from the use of rennet are referred to as junket, with true curds and whey only occurring from the natural separation of milk due to its environment (temperature, acidity).
Cheese curds, drained of the whey and served without further processing or aging, are popular in some French-speaking regions of Canada, such as Quebec, parts of Ontario, and Atlantic Canada. In Quebec, Eastern Ontario and the Eastern provinces such as New Brunswick, cheese curds are popularly served with french fries and gravy as poutine. In some parts of the U.S., especially in Wisconsin, they are breaded and fried, or are eaten straight.
Lactobacillus is a genus of bacteria which can convert sugars into lactic acid by means of fermentation. Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and galactose (monosaccharides). When pasteurized milk is heated to a temperature of 30-40 °C, or even at room temperature or refrigerator temperature, and a small amount of old curd or whey added to it, the lactobacillus in that curd or whey sample starts to grow. These convert the lactose into lactic acid, which imparts the sour taste to curd. Raw milk naturally contains lactobacillus.
Curds in song and poetry
Stately, pleasantly it sat,
A compact house and strong.
Then I went in:
The door of it was dry meat,
The threshold was bare bread,
cheese-curds the sides.
Smooth pillars of old cheese,
And sappy bacon props
Fine beams of mellow cream,
White rafters - real curds,
Kept up the house.
Curds also appear in the nursery rhyme Little Miss Muffet.
- Aarts, Mongolian fermented curd, eaten as a dried snack or reconstituted as a hot beverage
- Buffalo curd, traditionally made thick curd for dessert
- Coalhada, Brazilian curd
- Curd snack, a snack popular in the Baltic States
- Kurt or Qurut, central Asian cheese curd
- List of dairy products
- Ostkaka, Swedish style cheese cake, some call it a Swedish National dish
- Paskha, a Russian Easter dessert made of quark
- Skyr, Icelandic curd
- Thayir saadam, a daily dish of cooked rice mixed with curds, from South India
- Tofu, the coagulated product from soy milk, from eastern and south-eastern Asian countries
- Túró Rudi, a Hungarian chocolate bar with curd
- Urdă, a Balkans fresh white cheese made from whey.
- Discussion at StackExchange's "English language & usage" site
- SONGS OF LONG-HUSHED HARPS; Tunes That the Keltic Bards Set Ringing Centuries Ago in Praise of Love and War," New York Times. New York, N.Y.: Sep 10, 1911. p. BR540
-  Food and Agriculture Organization of the United Nations
- A fresh look at fine cheese, audio tour of Canada’s best cheese curds.
- Mrs Beeton,