Buttermilk

Traditionally buttermilk is the liquid that remains when cream is cultured with the appropriate bacteria and churned into butter. Today, commercial buttermilk is made of cultured skim milk that is heat treated to stop fermentation. Buttermilk has a tart, refreshing taste, and traditional buttermilk is a common drink in the deserts of Pakistan, Rajasthan, and Gujarat. Buttermilk powder is sold in large grocery stores.