Preheat your grill or smoker to 275°F. While it comes up to temp, trim any excess fat from the ribs. Then, using a sharp, heavy knife, cut off the lower portion of the ribs—the strip of cartilage and small bones along the bottom edge. This section is known as the rib tips. If you're going for a more uniform, St. Louis-style rack, this step will square up the slab and help it cook more evenly.
Once that section has been removed, peel off the membrane from the bone side of the ribs, apply a thin coat of Worcestershire sauce as a binder, and season both sides generously with your BBQ rub of choice. Once the smoker is preheated, add the ribs and smoke them untouched for 2 hours. At this point, remove the ribs from the grill.
Place the ribs on a piece of heavy-duty aluminum foil, meat side down, and wrap tightly with the apple cider. Return the ribs to the grill (still meat side down).
After 1 hour, check back in on the ribs. Once the bones start to show, they should be tender enough to continue. You can also pick them up with tongs to check their tenderness. If they have a nice bend to them when you pick them up – they’re good to go. If they’re still stiff, wrap them up and continue cooking for another 20 minutes before checking back in.
Once the ribs are tender, pull them off of the smoker, unwrap them, and let them rest for ~20 minutes to allow the muscles to loosen up so the liquids can reabsorb back into the meat.
Liberally apply BBQ sauce (here's the recipe for the mustard-based Georgia BBQ sauce I used) to both sides of the ribs, then follow up with a light dusting of rub to layer on even more flavor. Return the ribs to the smoker for about 20 minutes, just long enough for the sauce to tack up and set. Once the glaze is sticky and glossy, pull the ribs off, let them rest for about 20 minutes (or until cool enough to handle), then slice and serve. Enjoy!