Rinse beans; add 6 cups of water. Bring to a boil; simmer 5 minutes. Remove from heat; let stand, covered, 1 hour. Do not drain. After 1 hour cover, simmer 30 minutes. In Dutch oven, cook bacon until crisp. Drain, reserve drippings. Crumble bacon; set aside. Coat beef with flour. Brown beef in hot drippings, pour off excess fat. Stir in beans and onion. Combine tomato juice, brown sugar, salt, pepper and mustard. Pour over beans and beef mixture. Bake covered in 325 degree F. oven until tender, about 1 1/2 to 2 hours. Serve hot topped with crumbled bacon and grated cheese to taste.