Begin by preparing the pork: Cut it into 1/4-inch strips, about 3 inches long, preferably against the grain. Place the sliced pork in a bowl and season with a generous pinch of salt.
In a blender, combine the garlic cloves, both soy sauces, oyster sauce, brown sugar, cilantro stems, fish sauce, white pepper, oil, and coconut milk. Add 2 tablespoons of water and blend until smooth.
Pour the marinade over the pork and mix well to coat. Cover the bowl with plastic wrap and marinate for at least 3 hours, preferably overnight.
While the pork is marinating, soak the wooden skewers in water. This can also be done overnight.
When done marinating, ribbon on 2-3 pieces of pork on the skewer. Folding the meat in a zig-zag motion. The folds of pork should be touching but not tight.
Preheat the grill to 500°F. Once hot, place the skewers directly on clean grates. Close the lid and cook, rotating every 5 minutes. Cook for 15 minutes, or until the internal temperature reaches at least 145°F (always check for doneness before removing off the grill).