Whisk all ingredients together in a bowl.
Add scored and cut London broil to a ziplock bag.
Add ingredients to the bag with the meat and rub around until the meat is completely covered.
Fold the bag over the meat and try to squeeze out as much air as you can from the bag and seal shut.
Place in refrigerator for a few hours to overnight or up to 2 days.
Heat the oven to broil.
Put the oven rack on the highest level closest to the heating element.
In a frying pan, sear on both sides.
Place the meat on a foil-lined cookie sheet or a broiler pan.
Place meat in the oven on the highest rack for a couple of minutes per side or until desired doneness.
Let rest for 10 minutes after removing it from the oven.
Slice the meat thinly with a sharp knife. Enjoy!