In a food processor (or mortar and pestle), blitz white peppercorns into a powder. Add garlic, cilantro roots, and salt and blend until you achieve a smooth paste. Transfer to a large bowl.
Add coconut cream, oyster sauce, and soy sauce. Mix well.
Add the pork and toss to coat. Cover with plastic wrap and store in the fridge overnight. Also soak 12 bamboo skewers overnight.
Remove marinated pork from the fridge, add cornstarch and stir to fully incorporate.
Thread 4 pork slices onto one half of each skewer, pinching the meat in the middle as you push the skewer through the middle.
Turn your barbecue on and ensure it is set to high heat. Brush the grill with coconut milk, which will prevent the pork from sticking to the grill.
Place the pork skewers on the grill and cook until the meat begins to char, 8-10 minutes. Turn and brush the other side with coconut milk, cooking for another 5-6 minutes, or until a nice char appears.
Serve Moo Ping hot with steamed rice.