qt. buttermilk

Buttermilk is the liquid byproduct that remains after churning butter from cultured cream, characterized by a tangy flavor and acidic pH. Traditional buttermilk, still produced in some artisanal and international settings, is relatively thin with subtle butter flavor notes and a slight grain from residual butterfat. Modern commercial buttermilk, more commonly available in contemporary kitchens, is cultured milk produced by inoculating pasteurized milk with lactic acid bacteria (typically Lactococcus lactis), creating a thicker, more uniformly acidic product with a distinctly tart taste and creamy mouthfeel.

Buttermilk functions as a tenderizer and leavening agent in baking, where its acidity reacts with baking soda to create lift in pancakes, waffles, biscuits, and quick breads. In savory cooking, it serves as a marinade base for fried chicken and other meats, breaking down proteins while imparting tenderness. Buttermilk is also used in salad dressings, cold soups (particularly Southern and Scandinavian cuisines), buttermilk pie, and as a base for beverages in South Asian and Middle Eastern cuisines. The acidity makes it valuable for acidulating other ingredients and for setting proper crumb structure in cakes and coffee cakes.