You gotta love the lentil.The small, lens-shaped legume lets its showy cousins, the bean and the pea, take the spotlight. But cooks the world over know that lentils are an easy and quick preparation with a unique flavor. This is a food that plays well with others.From a nutritional standpoint, lentils are hard to beat. High in fiber and protein, they also are loaded with folic acid, iron, phosphorus and potassium, according to the Mayo Clinic. Lentils also are low on the glycemic index.