Combine spices in a shallow pan large enough to hold London Broil. Coat entire broil with rub mixture and cover pan with plastic wrap.
Set aside at room temperture for approximately 2-3 hours or refrigerate overnight. Meat will look we Tbsp Pat dry but don't remove rub.
Pre-heat gas grill on HIGH for 10 minutes. Reduce heat to MEDIUM and place meat on center of grill. Close cover and grill for 10-15 minutes; turn meat over and grill for an additional 10-15 minutes for medium-rare. Use tongs. Don't pierce meat with fork, so as to retain jucies.
For conventional charcoal grilling, start coals and let burn down to a light grey. Place rack approximately 6 inches from coals. Proceed as above.Servings: 4