Lentils, e.g. are a type of legume, which is a plant-based food that belongs to the Fabaceae family. They are small, round and flat in shape, and come in a variety of colors including green, brown, red and black. Lentils are a great source of protein, fiber, vitamins and minerals, and are often used in soups, stews, salads and other dishes. They are also a popular ingredient in vegetarian and vegan diets.