Trim the membrane from the back of the pork ribs using a sharp knife and a good grip. Cut the racks in half. Season all sides liberally with the spice mix.
When ready to cook, arrange heated coals for indirect heat with a drip pan positioned below where the ribs will be placed. Allow the grill to preheat to 250 degrees.
Throw a few chunks of lump hardwood over the hot coals to create a delicious smoked flavor. Cover and cook for about 1 hour, keeping an eye on the temperature.