MARINATE THE RIBS
Start by pounding garlic, black peppercorns, and coriander root in a mortar and pestle. If you don’t have a mortar and pestle, a food processor will work just fine.
In a large bowl, mix together the ground ingredients with oyster sauce, light soy sauce, and white sugar. Stir everything until you have a well-blended marinade.
Add the ribs to the bowl, and make sure each piece is coated with the marinade. Cover the bowl and refrigerate. Let the ribs marinate for at least three hours, or overnight for the best flavors.
GRILL THE RIBS
Charcoal grilling: Fire up the grill to medium heat. Place the ribs on the grill, cooking each side for about one minute to get a crispy crust. Then, lower the heat and continue to grill, turning the ribs occasionally to avoid burning. The cooking time varies depending on the rib thickness and size, expect about 10–15 minutes.
Oven baking: For oven baking, preheat your oven to 350°F (175°C). Line a tray with foil, arrange the ribs with space between them, and bake until done.