A soft, white, unripened, cow's milk cheese with the texture and flavor of sour cream that is sold in pots. Available in low-fat and nonfat versions. Low-fat quark has a richer texture than low-fat sour cream and a milder flavor and richer texture than low-fat yogurt. Quark simply means "curd" in German and the cheese is said to date from the Iron Age. Quark can be made from whole, skimmed or semi-skimmed milk or even buttermilk. Soft and moist, like a cross between yogurt and fromage frais, it should taste lemon-fresh. Some versions have skimmed milk powder added and can be rather gritty.