- 1 medium onion, chopped
- 1/2 cup ketchup
- 1/4 cup cider vinegar
- 1 tablespoon paprika
- 1 tablespoon canola oil
- 2 teaspoons chili powder
- 1 teaspoon salt
- 1/8 teaspoon pepper
- 1 1/2 pounds beef flank steak
- In a large resealable plastic bag, combine the first eight ingredients; add steak. Seal bag and turn to coat; refrigerate for 3 hours or overnight, turning occasionally.
- Coat grill rack with nonstick cooking spray before starting the grill. Drain and discard marinade. Grill steak, covered, over medium-hot heat for 6-8 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.