Buttermilk

Buttermilk is a fermented dairy drink. Traditionally, it was the liquid left behind after churning butter out of cultured cream. As most modern butter in western countries is not made with cultured cream but uncultured sweet cream, most modern buttermilk in western countries is cultured separately. It is common in warm climates where unrefrigerated milk sours quickly.

Buttermilk
Milk (left) compared to buttermilk (right). Buttermilk is thicker and leaves a more visible residue on the glass.
CourseBeverage
Serving temperatureChilled
Main ingredientsMilk
Food energy
(per serving)
40 (100 grams) kcal
Buttermilk
Nutritional value per 100 g (3.5 oz)
Energy169 kJ (40 kcal)
4.8 g
0.9 g
3.3 g
MineralsQuantity
%DV
Calcium
12%
116 mg
Percentages are roughly approximated using US recommendations for adults.

Buttermilk can be drunk straight, and it can also be used in cooking. In making soda bread, the acid in buttermilk reacts with the raising agent, sodium bicarbonate, to produce carbon dioxide which acts as the leavening agent. Buttermilk is also used in marination, especially of chicken and pork.

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