The best thing about this soup is that you can customize it based on what you have in your kitchen or what you're craving! Feel free to swap or add in vegetables to this soup. You really can't go wrong! Cabbage or broccoli would be delicious additions. You can also swap out the curly kale with a different green. I recommend using a sturdier green like swiss chard or lacinato kale so it doesn't get too wilted.