2 tablespoons red wine vinegar
2 tablespoons pineapple juice
4 1/2 teaspoons brown sugar
1 tablespoon liquid smoke flavoring
1 1/2 teaspoons soy sauce
1/2 teaspoon salt
1/4 teaspoon onion powder
1/8 teaspoon pepper
1 garlic clove, minced
3/4 pound boneless beef sirloin steak, 1 inch thick
In a large resealable plastic bag, combine the first nine ingredients; add steak. Seal bag and turn to coat; refrigerate overnight.
Drain and discard marinade. Grill steak, uncovered, over medium heat for 4-8 minutes on each side or until meat reaches desired doneness (for medium-rare, a meat thermometer should read 145 degrees F; medium, 160 degrees F; well-done, 170 degrees F).