In a large pot, combine ingredients for marinade, and simmer over medium heat until flavors meld. Let mixture cool, place meat in a shallow dish, pour marinade over meat, and let marinate in the refrigerator for 2 hours. Place meat in clean shallow dish and cover with Italian dressing. Marinate for 1 more hour in the refrigerator.
Preheat a grill to 425 degrees F.
Grill steak, along with onions and peppers, for 10 minutes on each side. Remove from heat and let rest for 5 minutes. Slice meat into strips, cutting across the grain. Top with your favorite toppings, and serve with flour or corn tortillas.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.