Brown the gound beef, together with the chopped onion, stirring constantly (about 5 minutes), until the beef no longer shows any pink and the onions are softened. Pour the meat mixture into a large oven-proof bowl or pot. Add in all of the other ingredients. Mix well. Cover the baking dish with a lid or with aluminum foil. Bake at 350 degrees for 1 hour. (Remove the lid or foil after 45 minutes, and stir.) These are simply the best tasting BBQ beans you can find anywhere