1/3 cup chopped onion
1 tablespoon red wine vinegar or cider vinegar
1 tablespoon canola oil
1 teaspoon pepper
1/2 teaspoon salt
1 garlic clove, minced
1/4 teaspoon dried rosemary, crushed
1/4 teaspoon dried basil
1 (1 1/2-pound) beef flank steak
In a bowl, combine the first eight ingredients; brush over both sides of steak. Place in a large resealable plastic bag; seal bag and refrigerate for 3-4 hours or overnight.
Place steak on a broiler pan. Broil 3-4 in. from the 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). Thinly slice across the grain.