In a medium skillet, saute the onions, bell peppers and garlic in the butter until tender. Add the ketchup, carrots, basil, and fresh and canned tomatoes, then cook for 10 to 15 minutes more. Add the string beans, season with salt and pepper and continue cooking until the vegetables are tender, taking care not to overcook the beans. Serve over rice or as a side dish.
Recipe adapted from Home Cooking with Trisha Yearwood (c) Clarkson Potter 2010