Remove the ribs from the package and peel the membrane off. Generously coat one side with lime juice and rub in. Spread a light coating of mustard on the ribs and rub in. Generously season with the Rib Rub. Repeat on the other side. For even more tenderness, cover and place in the refrigerator for 1 hour (optional).
Remove the ribs from the refrigerator and let warm to room temperature. Preheat the smoker to 250 degrees F.
Slice the ribs individually and coat again with mustard and seasoning to get all sides seasoned.
When the coals are white hot, add some cherry or apple wood chunks. Place the ribs on the smoker and cook for 45 minutes, then flip over and cook for another 45 minutes, or until the internal temperature is 165 degrees F. You can also do this on a grill, over indirect heat.
Remove the ribs and place in a large foil pan. Cut the butter into slices and evenly place on top of the ribs.
In a medium bowl, whisk together the sauce ingredients. Evenly pour the sauce on the ribs. Cover the pan with tin foil and place back on the smoker for 1 hour.
Remove the foil from the pan and let them cook for another 30 minutes. Place the ribs on a platter and pour the sauce from the foil pan over the ribs. Serve.