Combine all ingredients in a blender and pulse to mix well.
Transfer to zippered bag and place London Broil inside.
Place in refrigerator and allow to marinate for at least 4 hours.
Heat grill and wet a paper towel in vegetable oil and wipe down grates to avoid sticking.
Cook over medium high heat to get a good char on the outside while the center remains rare to medium rare.
Check internal temperature for 145 degrees.
Remove to cutting board and allow meat to rest for 10 minutes.
Cut across the grain in thin slices to make meat tender.