Remove the leg of lamb from the refrigerator and let it rest at room temperature for at least 30 minutes to ensure even cooking.
In a small bowl, combine the salt, pepper, garlic powder, smoked paprika, and brown sugar. This will be your dry rub.
Rub the leg of lamb with olive oil, then generously sprinkle with the spice mixture. Massage it in so it adheres well.
Preheat your grill to medium-high heat (approximately 350°F/180°C). If using a charcoal grill, create an indirect heat zone for slow cooking.
Place the leg of lamb on the grill and cook for 30 minutes, turning occasionally to ensure even searing on all sides.
In a small bowl, combine the Worcestershire sauce, lemon juice, and chopped rosemary. Brush the meat with this mixture during the last 20 minutes of grilling.
During the last 10 minutes, brush the meat with BBQ sauce and continue grilling until the glaze is slightly caramelized.
Remove the leg of lamb from the grill and let it rest for at least 15 minutes. This will allow the juices to redistribute, resulting in a more succulent roast.
Slice thinly and serve with a fresh salad or grilled vegetables.
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