This tasty, nutrient-rich lentil and sweet potato dish is easy to prepare and makes a satisfying meat-free meal. The pictured dish contained red lentils, but feel free to use what you have on hand. Cooking times can vary a bit depending on the variety, so check the time guide below the recipe if you use another kind. For a heartier non-vegetarian dish, add some diced cooked ham to the pan with the onions or garnish the finished dish with cooked crumbled bacon. Or add diced smoked sausage, such as spicy andouille sausage or kielbasa. Diced carrots or butternut squash can be added instead of sweet potatoes.