of sour cream

Sour cream is a cultured dairy product created by fermenting regular cream with lactic acid bacteria, typically Lactobacillus lactis. The fermentation process lowers the pH of the cream, causing it to thicken and develop a characteristically tangy, slightly acidic flavor. This transformation occurs naturally through bacterial action, which consumes lactose and produces lactic acid as a byproduct.

Sour cream typically contains 18-20% milk fat and has a smooth, pourable to spoonable consistency depending on its fat content and age. The flavor ranges from mildly tart to distinctly sharp, and the product has a white to off-white color. Unlike crème fraîche, which is commonly used in French cooking, American and Eastern European sour cream contains added stabilizers and thickening agents, giving it a more uniform texture.

Sour cream is fundamental in both sweet and savory applications across European and North American cuisines. In baking, it adds moisture and tenderness to cakes, muffins, and quick breads while contributing its signature tang to flavor profiles. In savory cooking, it serves as a topping for baked potatoes, tacos, and borscht, and is a key ingredient in dips, dressings, and sauces. Eastern European cuisine features it prominently in blini toppings, as a component in stroganoff dishes, and in pierogi fillings. The acidic nature of sour cream makes it an excellent marinade component for meat and a brightening agent in rich, heavy sauces where it balances fat with acidity.