Ingredients

3 tablespoons olive oil
4 tablespoons red wine vinegar
1 tablespoon balsamic vinegar
1 teaspoon sea salt
1 clove garlic, minced
1/2 teaspoon freshly cracked pepper
1 teaspoon dried rosemary
2 lbs london broil beef

Directions

Mix olive oil, vinegars, salt, garlic, pepper and rosemary.Pour over london broil and marinate 4 hours or overnight.Grill 15 minutes on each side, or until desired doneness.