Grilled London Broil

Directions

1. Place the steak in a large resealable plastic storage bag. In a medium bowl, combine 1/2 c. vinegar, the oil, 1/4 c. mustard, the garlic, 1/2 tsp. salt, and the pepper; mix well. Pour over the steak, then seal the bag and refrigeratefor 1 hour.
2. Meanwhile, heat the butter in a large skillet over medium-high heat. Add in the onions and saute/fry for 12 to 15 min, or possibly till very tender, stirring occasionally. Add in the remaining 1/4 c. mustard, 1/4 c. vinegar, and 3/4 tsp. salt. Reduce the heat to medium-low and cook till the mix thickens, stirring often.
3. Preheat the grill to high heat. Grill the steak for 12 to 15 min for medium-rare, or possibly to desired doneness, turning frequently; baste often with the marinade for only the first 5 min of cooking.
4. Thinly slice the steak and serve topped with the sauteed onions.
5. This recipe yields 6 servings.