Fire up your smoker to 225°F (107°C). If you’re using a charcoal grill, make sure you set up for 2-zone cooking, with the indirect side for your ribs. Add smoking wood to coals or wood tray.
Remove the membrane from the back side of the ribs
In a small bowl, combine the dry rub ingredients. Use a fork or whisk to combine, removing any clumps that may appear.
Apply the dry rub to the baby back ribs, covering both sides. Apply generously and evenly.
Once smoker is at target temperature, place the ribs on your smoker’s grates. Close lid and leave to smoke.
After 1 hour, combine apple juice and cold water in a food-safe spray bottle. Then, open smoker and lightly spritz the top of ribs. Repeat every 30 minutes.
Once the ribs have been smoking for 3 hours, remove the ribs from the smoker and place on top of 2 sheets of aluminum foil.
Fold the edges of the foil to create a pouch with the ribs sitting in the middle. Sprinkle brown sugar over the top of the ribs, and place the butter slices on top, followed by the apple juice.
Tightly fold the aluminum foil over the ribs to create an airtight seal.
Transfer rib pouch back to the smoker and continue to cook at 225°F (107°C). Let the ribs cook for a further 2 hours.
Remove the ribs from the smoker. Carefully open the foil pouch and allow steam to escape. Remove ribs and discard the foil pouch and liquid contents.
Use a brush to apply BBQ sauce on both sides of the rib rack
Place baby back ribs back on smoker grates. Close lid and continue to smoke at 225°F for 1 more hour, or until BBQ sauce has set and ribs hit an internal temperature of 200-205°F (93-96°C).
Pull the ribs from the smoker. Leave to rest for 10 minutes before slicing into individual ribs or mini-racks to serve. Enjoy!