in a roasting pan and scatter the onion rings over it. Combine the remaining ingredients and stir until the sugar dissolves. Pour this over the meat and cover with plastic wrap. Refrigerate 12 hours or so turning every once in a while.
2. Preheat the oven to 325F
3. Place the meat in the oven and bake, basting frequently, about 3 1/2 hours, or until the meat is thouroughly cooked.