Place kabobs on grid over medium, ash-covered coals. Grill, uncovered, about 9 to 11 minutes for medium rare to medium doneness, turning occasionally. Serve with orzo. (Or to broil, place kabobs on rack in broiler pan so surface of beef is 3 to 4 inches from heat. Broil about 9 to 12 minutes for medium rare to medium doneness, turning once.)