Americans eat more potatoes than any other vegetable. Potatoes fall into a family of vegetables known as tubers, which also includes sweet potatoes, marble potatoes, fingerling potatoes, and Yukon Gold potatoes. Chefs divide potatoes into two categories: those that are mealy (fluffy and flake apart) when cooked, such as russet potatoes, and those that hold their shape when cooked, such as new potatoes. Store potatoes in a dark, dry, cool place, and they will keep for a few weeks.