Ingredients

3/4 cup A-1 Steak Sauce
1 1/2 lbs top round london broil beef or flank steak
1/4 cup spicy brown mustard

Directions

Combine 1/2 cup of the steak sauce and the London Broil in a large resealable plastic bag; seal and marinate in refrigerator for at least 1 hour and up to 8 hours.Stir together the remaining steak sauce and the mustard in a small bowl; set aside.

Preheat grill to high; remove steak from bag, discarding marinade.coat rack of grill with cooking spray and cook steak, turning once, to desired degree of doneness, 8 minutes for medium-rare.Serve thinly sliced steak with the mustard steak sauce.