If you want kale in your minestrone, make sure to rip it into small pieces, drizzle some olive oil over it, and massage it until it turns bright green before adding it to the soup. This extra step will make your kale tender and delicious! You will want to add the kale about the same time you add the pasta, so it will not overcook. (If you are using spinach, simply add it a minute or two before serving allowing it to wilt in the soup, but not cook).