Lentils are another member of the legume family and are chock full of fiber and protein. They're also super easy to make. And unlike their bean brothers, lentils don't need to be soaked first, which means you can pop them right on the stove after a quick rinse. Brown lentils are the cheapest and best option for soups because of their mushy cooked texture. Green lentils are firmer and more flavorful, so they go great in salads, and sweet red lentils make excellent additions to Indian food.