Freeze the London Broil for 30 minutes to an hour to make it easier to slice.
Remove beef from the freezer and slice 1/8″ thick across the grain.
Place beef slices in a shallow glass dish.
In a medium bowl, whisk all remaining ingredients together and pour over beef, tossing with your hands to coat.
Cover with plastic wrap and marinate overnight.
Preheat oven to 170F.
Line one or two (depending on the size of the London Broil) rimmed baking sheets with aluminum foil. Place a stainless steel rack inside of the pan(s).
Rub the racks with a little coconut or olive oil.
Lay the beef slices on the rack(s) leaving just a little room in between slices for air to circulate.
Place in preheated oven and then prop the door open to allow moisture to escape (I use a large wooden or silicone spoon).
Dry in oven for 3-5 hours (I lean toward about 4). Time will depend on how thick your slices are. Check them at three hours and determine if it needs more time.
Allow to cool completely. Jerky should be easily pried off the racks.