Warm oil in a large pot over medium heat. Add chopped onion, carrots, celery and garlic and sauté until tender and translucent, about 6-8 minutes.Stir in the tomato paste and rosemary and cook for 2 minutes, or until fragrant.Add the white beans, salt, pepper and parmesan rind. Try to mash a few of the beans in the pot. This will help thicken the soup later.Pour in the stock. Raise the heat to high and bring soup to a boil. Lower heat so that soup gently simmers and partially cover the pot. Simmer for 20 minutes (or longer if you want), or until vegetables are tender.Stir in kale leaves and simmer another 8 minutes or until kale is tender. Taste for seasoning and serve with or without desired accompaniments.