Easy Fat-Free Dal Tadka (1/2 cup split red lentils (masoor dal), 1/2 cup yellow moong dal (split mung beans) OR yellow split peas OR additional red lentils, 3 c water, 1 large tomato, 3 cloves garlic, 1 t ginger root, 1 t cumin seeds, 1/2 t turmeric, 1/2 t salt, 1/2 t garam masala + more to taste, 1 large onion, (1/2 sliced and 1/2 chopped), and 1/2 t red pepper flakes)