For marinade, combine Wish-Bone® Italian Dressing, lime juice, cilantro, cumin, chili and grated lime peel.
Pour 1/2 cup marinade over steak in large, shallow nonaluminum baking dish or plastic bag; turn to coat. Cover, or close bag, and marinate in refrigerator, turning occasionally, 3 to 24 hours. Refrigerate remaining marinade.
Remove steak from marinade, discarding marinade. Grill or broil steak, green peppers and onion, turning once and brushing frequently with refrigerated marinade, until steak is desired doneness.
To serve, thinly slice steak and serve in warmed tortillas with green peppers and onion.