Can You Freeze Sour Cream?

3. How is sour cream made, exactly?

Sour cream is the result of adding lactic acid, a type of bacteria which is produced during fermentation, to sweet cream. The acid then sours and eventually thickens up the cream. Originally invented by the Mongols many centuries ago, sour cream has stood the test of time and is still a kitchen staple today as an ingredient in a number of recipes, including dips and garnishes, that require a touch of zingy tartness. For products labeled as real sour cream, the Food and Drug Administration requires that the content of butterfat be no less than 18%. However, light sour cream, made from half-and-half, and nonfat varieties are also available as healthier alternatives.