Heat up smoker to 225°F (107°C). If you are smoking on a charcoal grill, set the grill up for indirect grilling.

When the smoker is ready, add a few chunks of apple wood to the coals. Place rack of pork on smoker grates. Insert temperature probe. Close lid and cook for 4-5 hours, or until internal temperature has reached 140°F.

When the pork reaches 135-140°F, open the smoker lid and baste the rack with BBQ sauce. Apply generously and cover evenly. Leave to cook for 2-3 minutes.

Turn the rack over on the grates and apply sauce to the remaining side of the pork. Leave to cook for a few minutes, when the internal temperature has reached 145°F.

Using BBQ gloves, remove the pork rack from the smoker. Set to one side and leave to rest of 10 minutes.

To serve, slice cleanly between each rib.