A leek is a type of vegetable that looks similar to a long and skinny onion. It has a mild onion-like taste and is commonly used in cooking for its flavor and texture. Full definition
While potatoes are typically paired with leek in soup, I prefer turnips — being a lower glycemic (less starch / sugars) root vegetable. (daniellelevynutrition.com)
Add leeks in a single layer, cut side down, and cook until lightly browned, about 3 minutes. (stripedspatula.com)
@Lyndsy: I only started liking the taste of leeks in my 20s. (cookingninja.com)