This soup is super flexible—substitute veggies, toss in other greens, or add a swirl of coconut milk for creaminess. The flavors deepen after sitting, making leftovers even better. Freezes and reheats well. For a tomato-free version, just skip tomatoes and add more broth. Use red lentils for a creamier texture and shorter cook time. For more protein, stir in cooked chicken or sausage.