Score meat, diagonally, on both sides. Combine remaining ingredients except water and cornstarch; pour over meat. Cover; refrigerate several hours or overnight, turning once. Reserving marinade, place meat on rack of broiler or on grill, so meat is 6 to 7" from the heat. Broil meat, about 6 minutes on each side or until desired doneness. Pour reserved marinade in a small saucepan; bring to a boil. Dissolve cornstarch in water; add to marinade. Continue cooking for 2 to 3 minutes or until thickened. Serve with flank steak. Makes 8 servings.