Pat the lamb leg dry with paper towels, then use a sharp knife to trim away any excess silverskin.
In a bowl, combine the salt, pepper, garlic powder, smoked paprika, brown sugar, cumin, and chopped rosemary. Rub the mixture all over the lamb leg, ensuring it's well coated.
Refrigerate the lamb leg for at least 6 hours, or preferably overnight, to allow the flavors to meld.
Preheat your smoker or grill to 225-250°F (110-120°C), and prepare your chosen smoking wood for the desired flavor.
Place the lamb leg directly on the smoker rack and smoke for 5-6 hours, or until the outer bark has formed and the internal temperature reaches 165°F (75°C).
Spritz the lamb leg with apple cider vinegar every 1-2 hours to help retain moisture and promote bark formation.
In a small bowl, whisk together the honey, BBQ sauce, Worcestershire sauce, and apple cider vinegar.
Once the lamb leg reaches an internal temperature of 165°F (75°C), glaze it with the sauce, then wrap it in butcher paper or aluminum foil. Return it to the smoker for another 3-4 hours, or until the internal temperature reaches 195-200°F (90-93°C).
Remove the lamb leg from the smoker and let it rest for at least 30 minutes to allow the juices to redistribute.
Thinly slice or shred the lamb leg and serve with fresh bread, grilled vegetables, or coleslaw.
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