Leeks are a type of vegetable that belong to the allium family, which also includes onions, garlic, and shallots. They have a long, cylindrical shape and are known for their mild, sweet flavor. The edible part of the leek is the white and light green stalk, while the dark green leaves are often discarded or used for flavoring in soups and stocks. These versatile vegetables can be used in a variety of dishes, from soups and stews to salads and casseroles. Leeks are rich in vitamins and minerals, making them a healthy addition to meals. They are especially popular in French cuisine, where they are often featured in recipes like potato leek soup.