This healthy and flavorful lentil soup is a great way to get your protein and veggies in one bowl. Use a food processor to chop onions, carrots, celery, and garlic. In the Dutch oven, sauté the vegetables until tender, then add lentils and vegetable broth. Simmer until the lentils are cooked through and the flavors have melded together. Serve with a sprinkle of fresh herbs and a slice of crusty bread.