Score the fat cap in a cross-hatch pattern with cuts spaced 1 inch apart. Slice only through the fat — stop before hitting the meat layer. This allows the rub to penetrate and the fat to render evenly during the long cook.
Combine all dry rub ingredients in a small bowl: kosher salt, black pepper, brown sugar, garlic powder, smoked paprika, and cayenne. Apply the rub generously to all sides of the pork belly, pressing firmly into the score marks. Let the seasoned belly rest at room temperature for 30 minutes while you prepare the smoker.
Preheat your smoker to 225°F and set it up for indirect heat. Add apple or cherry wood chunks or chips — these fruit woods provide a mild, sweet smoke that complements pork belly perfectly without overpowering it.
Place the pork belly fat-side up on the smoker grates over indirect heat. Fat-side up allows the rendering fat to baste the meat below as it drips through, keeping the interior moist throughout the long cook.
Smoke until the internal temperature reaches 165–175°F, approximately 3–4 hours. This is the stall — the point where evaporative cooling causes the temperature to plateau. Beginning around hour 3, spritz with apple cider vinegar or apple juice every 60 minutes to keep the surface moist and promote bark development.
Decision point: For the best bark, leave the pork belly unwrapped and continue smoking. For a faster cook (saves 1–2 hours), wrap tightly in heavy-duty aluminum foil at the stall. Either way, continue cooking until internal temperature reaches 195–203°F — the point where the fat is fully rendered and the meat is pull-apart tender. Total cook time is approximately 6–8 hours at 225°F.
Optional BBQ sauce glaze: When the internal temperature hits 195°F, brush BBQ sauce evenly over the pork belly. Leave unwrapped and smoke for an additional 20–30 minutes until the glaze caramelizes into a sticky, lacquered finish.
Remove the pork belly from the smoker and rest for 10–15 minutes before slicing. This allows the juices to redistribute throughout the meat. Slice into thick pieces perpendicular to the grain and serve immediately.