Graters and zesters reduce foods into various sizes and textures so they can better spread and incorporate with your recipes. They tame the power of citrus rinds, nutmeg and ginger, and they help you spread the richness of soft cheeses and chocolate. Plus, who doesn't like some grated carrot on their salad? If you were limited to one, go with a full sized box grater. But active cooks will probably want to acquire a zester and/or hand grater as well.