Mix garlic salt, paprika and pepper. Sprinkle over chicken, covering the entire surface. Place chicken on the grill skin side up over a medium hot fire. Cover and grill for 30 minutes, turn and cook another 15 minutes. While chicken is grilling make a baste by stirring together the remaining ingredients in a small saucepan. Bring mixture to a boil, then turn down heat and simmer for 10 minutes. When chicken is tender, baste entire surface and cook for another 5 minutes, turn and baste again. Chicken is done when it has a good glaze on it (be careful not to burn).