Score steak on both sides.Pour combined ingredients over steak. Cover;marinate in refrigerator several hours or overnight,turning once. Place steak on rack of broiler pan.Broil 15 to 20 minutes or until desired doneness,brushing frequently with barbecue sauce mixture and turning occasionally.To serve,carve steak across grain with slanted knife,into thin slices.Makes 4 to 6 servings.