1. Soak beans overnight, or using the quick soak method, by bringing the beans to a boil for a minute, removing from heat, covering and setting aside for an hour.
2. Heat oil in a large saucepan or Dutch oven. Add onion, garlic, and red bell pepper and saute until tender, about 10 minutes. Add beans and thyme, stir well. Add vegetable broth or water, parmesan cheese rind, and bring to a boil, reduce heat, partially cover and simmer 1 hour or until beans are tender. Add spinach, tomatoes, and heat thorougly. Yield: 14 cups.