Cut the pork into roughly 1/3-inch thick, 2-3 inch wide/long slices and place into a container.
Clean the garlic cloves, then crush them with the flat side of a butcher knife.
Cut the crushed garlic cloves into thin slices and add to the container with pork.
Add oyster sauce, MSG, sugar, salt, cooking oil, and ground red pepper to the container with pork, then mix everything together.
Let the pork marinate for at least 30 minutes, though the longer you keep it in the marinade the richer will be the taste.
Turn on the grill and heat until the temperature reading shows 300F. Then, apply a thin coat of cooking oil on the grill surface.
Lay the marinated pork slices evenly on top of the grill and cover.
Flip the pork a single time, allowing about 5 minutes of cooking per side. The pork will be sufficiently cooked through once it reaches an internal temperature of 150F/65C. At this point, you can remove it from the grill and set aside on a cutting board.
Once the pork has cooled a bit, slice it into thin strips.