Stories We Like: A Guide to the Comma
the fluid remaining when the fat is removed by churning cream into butter. It was formerly used as a beverage, but today it is mostly condensed or dried for use in the baking and frozen desserts industry. It has been replaced as a beverage by cultured buttermilk, which is prepared from skim or low-fat milk by fermentation with bacteria that produces lactic acid. The resulting product is thicker than traditional buttermilk but is similar to it in other respects.