Vegan sweet potato & lentil Indian stew. Water sauté 1 chopped yellow onion, 1 chopped sweet potato, 1/2 cup chopped celery, and minced garlic to taste. Add 1 14.5-ounce can diced tomatoes, a 12-ounce package precooked lentils, 1 teaspoon minced fresh ginger, and 5 cups vegetable broth. Add 1-2 tablespoons garam masala, then cumin, cayenne, cilantro, salt, and pepper to taste. Bring to boil, lower heat, and simmer 10-15 minutes. Serve with rice or roti; serves 4.