buttermilk --
Lower in fat than whole milk but rich in calcium and protein; cultured buttermilk contains beneficial probiotics from fermentation. Provides B vitamins and lactose levels are reduced due to bacterial fermentation.
About
Buttermilk is the tangy liquid byproduct left after churning butter from cream, or in modern commercial production, a cultured dairy product made by fermenting milk with lactic acid bacteria (typically Lactococcus lactis). Traditional buttermilk, still produced in some artisanal dairies, is thin and slightly watery with a faint butter flavor and mild sourness. Modern cultured buttermilk, the predominant commercial form, is thicker, creamier, and more distinctly tart due to lactic acid fermentation, though lower in fat than traditional buttermilk.
The flavor is distinctly tangy and slightly salty, with a creamy mouthfeel. Buttermilk's acidity and proteins make it a functional ingredient beyond its flavor contribution, enabling chemical reactions in baking and tenderizing marinades.
Culinary Uses
Buttermilk is fundamental to American and Southern baking, where its acidity reacts with baking soda to leaven biscuits, pancakes, waffles, and quick breads. It features prominently in cakes, muffins, and dressings (notably buttermilk ranch dressing). Beyond baking, buttermilk serves as a marinade base for fried chicken, tenderizing meat through enzymatic action. In savory applications, it's used in mashed potatoes, soups, and sauces for added tang and body. Indian lassi and Middle Eastern drinks incorporate buttermilk as a refreshing beverage component. The ingredient's acidity makes it versatile for substitution where tangy dairy products are needed.