In this video, you’ll learn all about yogurt-like, slightly tart-tasting buttermilk, including the difference between fresh and cultured buttermilk. Y... See moreou’ll see why adding buttermilk to baked goods makes them lighter, without adding a lot of extra fat. Discover buttermilk’s other secrets, like what it does for marinades. You’ll also see how to make a buttermilk substitute using regular milk. See how to make flakey Buttermilk Biscuits.