Picked up some london broil on sale for $1.99/LB yesterday at Safeway and decided to Google for a good recipe. Came across the Barbecue Pit Boys YouTube video and decided to try their recipe with a few substitutions:

YouTube URL

Ingredients: 

• 2-3 LBs of London Broil (4 Steaks)
• 1 12 to 16 oz bottle beer
  (I used Blue Moon Beligian White Wheat Ale)
• 1/2 Cup Olive Oil
• 1 tsp. Cayenne Pepper
• 1 T. Garlic Powder
• 1 tsp. Onion Powder
• 2 T. Worcheschire Sauce
• 1 T. Peppercorns (Substituted 1 T. Weber Grill Creations Black Peppercon Marinade Mix)
• 1 T. Prepared Horseradish
• Juice from 1/2 fresh lemon (Substituted 1/8 cup bottled lemon juice)

Mix ingredients thoroughly, split mixture into 2 half-gallon Zip-Lock bags, placing two steaks in each bag. Marinate steaks between 4-6 hours minimum. Since this cut of steak is tough, marinating overnight produces even better results. Preheat grill to 375 degrees (roughly medium); cook each side approximately 8 minutes for medium rare. For best results use a meat thermometer. Temperature desired for medium rare steaks is between 130 and 135 degrees. Cut steak across the grain in thin slices.

Barbecue Pit Boys website: Steak Recipes