In a large skillet, fry chopped bacon and diced onions over medium heat for 2-3 minutes, just until the bacon begins to crisp up.
Add beans, brown sugar, ketchup, mustard, Worcestershire sauce, red wine vinegar and salt and pepper to the skillet and combine with the bacon and onions.
Transfer to 9×9 inch baking dish.
Bake at 350º Fahrenheit for 1 hour, or until sauce is thickened.