Santa Fe Steak

1 (1 1/4 pound) top round steak, cut 1-inch thick
1 large avocado, diced
1/2 cup chopped red onion

Marinade:
6 tablespoons frozen margarita drink mix concentrate, defrosted
2 tablespoons chopped fresh cilantro (no stems)
2 tablespoons vegetable oil
4 cloves garlic, crushed
2 teaspoons ground cumin
Salt and pepper to taste

Combine marinade ingredients, set aside 2 tablespoons in refrigerator. Place steak and marinade in a re-sealable plastic bag and turn to coat. Marinate in refrigerator for 6 to 8 hours.

Remove steak from bag and grill, turning occasionally, for 16 to 18 minutes or until desired doneness is achieved. Just before serving, combine avocado, onion, and remaining 2 tablespoons marinade. Toss gently to coat.

Serve with sliced steak.