In a small bowl, combine marmalade, orange juice, mustard, sugar and Gravy Master. Grill chicken pieces 4 to 6 inches from hot glowing coals for 15 minutes, turning frequently. Brush with orange-mustard glaze and continue grilling for 15 minutes longer, brushing frequently with glaze. Remove from grill and serve immediately. Serve remaining sauce separately.
Makes 4 servings.