Place the chicken pieces in a large container. Mix all the sauce ingredients in a saucepan and simmer for 10 minutes. Let cool, then pour the sauce over the chicken pieces. Marinate for 4 to 8 hours in the refrigerator, turning the chicken pieces 2 to 3 times. The chicken can be cooked immediately on the BBQ, but pre-cooking in the oven ensures a more uniform cooking. Place the chicken pieces in a Dutch oven and cover with half of the sauce and bake in a preheated oven at 350°F for about 45 minutes or until the meat is almost tender. Finish cooking on the BBQ or grill in the oven. Grill for about 10 minutes, turning the chicken pieces 1 to 2 times. Brush frequently with the remaining sauce until the skin is crispy and well browned.