Prep the aromatics: Using a mortar and pestle, pound the garlic and coriander roots together until they form a rough paste.
Mix the marinade: In a large bowl, whisk together the coconut milk, palm sugar, oyster sauce, light and dark soy sauces, tapioca starch, and white pepper.
Marinate: Add the thinly sliced pork to the bowl and toss thoroughly to coat. Cover and refrigerate for at least 4 hours (ideally overnight) for the best flavor.
Prepare the skewers: Soak your bamboo skewers in water for 20 minutes to prevent burning, then thread the marinated pork strips tightly onto the sticks.
Grill and glaze: Lightly oil your grill and cook over medium heat for 2–3 minutes per side. Flip until the pork is fully cooked and has a beautiful, caramelized char.
Serve: Enjoy hot, traditionally served with a side of warm sticky rice (khao niao).