Set Traeger Grills temperature to 250℉ and preheat, lid closed for 15 min
While the Traeger comes to temperature, trim off any excess fat from the pork shoulder
Generously season on all sides and let sit for 20 minutes
Place the pork fat side up directly on the grill grate and cook until internal temperature reaches 160℉, about 3 to 5 hours
Remove the pork from the grill
On a large baking sheet, stack 4 large pieces of aluminum foil on top of each other, making sure they are wide enough to wrap on all sides. If not, overlap the pieces to create a wider base. Place the pork in the center of the foil, then bring the sides of the foil up before pouring the apple cider on top of the pork. Wrap the foil tightly around the pork, ensuring the cider does not escape.
Place the foil-wrapped pork back on the grill fat side up and cook until the internal temperature reaches 204℉ in the thickest part of the meat, about 3 to 4 hours longer
Remove from the grill and allow the pork to rest for 45 minutes in the foil packet
Remove the pork from the foil and our off any excess liquid into a fat separator
Place the pork in a large dish and slice or shred the meat, removing and discarding the bone and excess fat. Add separated liquid back into pork and season to taste and add your favorite BBQ sauce if desired