STEP 3
Soak eight 9-inch bamboo skewers in water 10 minutes; drain. Remove beef from marinade; discard marinade. Alternately thread beef, onion, squash and pepper evenly onto skewers. Place on grid over medium, ash-covered coals. Grill, uncovered, 8 to 10 minutes (over medium heat on preheated gas grill, covered, 9 to 10 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally.