Got a hankering for beef fajitas? This recipe is every bit as easy as ordering from a restaurant. Marinate and grill beef Flank or Skirt steak, serve with peppers and onions. Easy as that.
Combine marinade ingredients in small bowl. Place beef Steak and marinade in food-safe plastic bag; turn Steak to coat. Close bag securely and marinate in refrigerator 6 hours or as long as overnight, turning occasionally.
Remove Steak from marinade; discard marinade. Place Steak in center of grid over medium, ash-covered coals; arrange onions and bell peppers around Steak. Grill Flank Steak, covered, 11 to 16 minutes (over medium heat on pre-heated grill, 16 to 21 minutes); Skirt Steak 7 to 12 minutes (8 to 12 minutes on gas grill) for medium rare (145°F) to medium (160°F) doneness, turning occasionally. Grill vegetables 13 to 16 minutes or until crisp-tender, turning occasionally.
Carve Flank Steak lengthwise in half, then crosswise into thin slices. (Carve Skirt Steak diagonally across the grain into thin slices.) Cut bell peppers into 1/2-inch strips; coarsely chop onions. Place Steak slices on tortillas; top with vegetables. Season with salt and pepper, as desired. Serve with guacamole, if desired.