In a large skillet cook and stir onion, sweet pepper, and garlic in hot butter over medium heat about 5 minutes or until tender. Stir in okra, tomato, salt, pepper, and, if desired, cayenne pepper. Bring to boiling; reduce heat. Simmer, covered, about 20 minutes for fresh okra (10 minutes for thawed okra) or until okra is very tender. If desired, sprinkle with bacon.