A soft, unripened cheese with the texture and flavor of sour cream, Quark comes in two versions — lowfat and nonfat. Though the calories are the same (35 per ounce), the texture of lowfat Quark is richer than that of lowfat sour cream. It has a milder flavor and richer texture than lowfat yogurt. Quark can be used as a sour cream substitute to top baked potatoes, and as an ingredient in a variety of dishes including cheesecakes, dips, salads and sauces. See also cheese.