To prepare on gas grill, preheat grill according to manufacturer's directions for medium heat. Grill steak, covered, 10 to 11 minutes for medium-rare doneness, turning occasionally. Do not overcook. One cup thinly sliced fresh cucumber or 2 grilled medium zucchini, cut lengthwise into quarters may be substituted for baby bok choy. Grilled zucchini quarters, over medium ash covered coals, 8 to 10 minutes, turning once. 1 to 1 1/2-pounds beef skirt steak may be substituted for top round steak. Grill, uncovered, over medium, ash-covered coals 10 to 13 minutes (over medium heat on preheated gas grill, covered, 8 to 12 minutes) for medium-rare to medium doneness. Carve steak diagonally across the grain into thin slices.