c dairy sour cream

Sour cream is a cultured dairy product produced by fermenting regular cream with lactic acid bacteria (typically Lactococcus lactis). The fermentation process converts lactose into lactic acid, which gives sour cream its characteristic tangy flavor and thick, smooth texture. The product typically contains 18-20% milk fat and achieves its distinctive sour taste through the acidification of the cream, which also causes the proteins to coagulate slightly, resulting in a creamy consistency. Sour cream originated in Eastern Europe and Russia, where the cool climate naturally favored the souring of cream before refrigeration became common.

Standard sour cream is distinguished from crème fraîche (which uses different bacterial cultures and has a higher fat content) and from Greek yogurt (which is strained further for increased thickness). The acidity level typically reaches a pH of around 4.5, making it noticeably tart.

Sour cream functions both as a finishing ingredient and as an active component in cooking. It is widely used as a topping for baked potatoes, tacos, borscht, and pierogi in Eastern European cuisines, and as a dollop on chili and Mexican dishes in North American cooking. In baking, sour cream adds moisture and tenderness to cakes, muffins, and quick breads while contributing to a fine crumb structure; the acidity reacts with baking soda to create lift. In sauces and dressings, it provides body and tang—such as in stroganoff, peppercorn sauces, and salad dressings. It may be thinned with milk or water for use in soups. The acidity makes it useful for marinating meats, and it can replace buttermilk in some applications.