Grease the baking dish with coconut oil. {I will also put aluminum foil down to make it an easy clean up - grease that as well}
Place beef on a cutting board. Score the beef with a "Criss Cross" pattern on both sides. You don't need to cut too deeply into the beef, just score it so that some of the seasonings seep into it.
Sprinkle one side of the beef with half of the Garlic Powder, half of the Onion Powder, and Salt {to your preference.} Drizzle Coconut Aminos on the beef and massage it in with the seasonings you already have on it.
Lay the seasoned side down on the foil/baking dish.
Now season the other side of the beef the same way as you did before with the Garlic Powder, Onion Powder, Salt and Coconut Aminos.
Pour the remaining Coconut Aminos on the top and sides of the Beef. Add ¼ cup of water to the Aminos that are on the sides. This will make a good gravy.
Slice up half of a large onion {I use purple onions} and scatter the slices over the beef and on the sides of the beef.
Broil for 10 minutes.
Take out of oven and flip the beef over so the opposite side is up.
Broil for another 5ish minutes. {Depending on the actually size of the beef, it may take more or less time. Watch it because it turns fast!}
Remove the beef, even if it is still more pink than you like, and slice it into thin slices. Lay the slices back into the baking dish and broil for 1-2 minutes, or your desired level of doneness.
Enjoy!
Recipe by 2 Cats and Chloe at http://www.2catsandchloe.com/2015/01/whole30-approved-narnies-london-broil-2-0.html