sour cream and chopped cilantro

Sour cream is a fermented dairy product made by culturing regular cream (the fat-rich layer of milk) with lactic acid bacteria, typically Lactococcus lactis. The bacterial fermentation acidifies the cream, lowering its pH and thickening its texture through the production of lactic acid, resulting in a tangy, rich condiment with a smooth, pourable consistency. Sour cream typically contains 18-20% milk fat and maintains a characteristic white color with a slightly viscous texture. The product originated in Eastern Europe and Russia, where cooler climates naturally encouraged the souring of cream, and has become a staple in North American and European cuisines.

Sour cream functions as both a finishing condiment and a baking ingredient. It is widely used as a topping for baked potatoes, tacos, Mexican soups, and Eastern European dishes such as borscht and stroganoff. In baking, it provides moisture and tang to cakes, muffins, and quick breads while also tenderizing crumb structure. Sour cream can be mixed into dressings, dips, and sauces for added richness and acidity, and is essential to many Eastern European and Latin American cuisines. Due to its fat content, it should be added to warm dishes off heat or gently warmed to prevent curdling.