Chef Skip Laskody
1) Take the Balsamic vinegar, brown sugar, dijon mustard and the garlic and put in a large ziploc bag. Place the London Broil in the bag and marinate for at least 2 hours.
2) Prepare the grill and then remove the steak from the bag. Season the steak with salt and pepper. Grill 6-7 minutes on each side, or until desired doneness. Move the steak to a cutting board and cut across the grain into thin slices.
3) In a large pot, heat over medium heat and add oinion to cook for 25-30 minutes until caramelized. Stir Frequently. Add the vinegar, sugar, roasted garlic until all the liquid is evaporated.