Leeks are in the same vegetable family as onions and garlic. They taste sweeter and milder than onions. Leeks are made up of elongated, white bulbs with broadening and darkening green leaves at their tops. The bulb comes to an end at a point, often with roots still attached. The bulbs and lighter green leaves are edible and can be eaten raw or cooked. The darker green leaves are much tougher and along with the roots, should be removed before eating or cooking.