Make marinade: Mix BBQ sauce, olive oil, garlic, herbs, lemon juice, salt, and pepper.

Marinate lamb in a large bag or dish, covered, for at least 4 hours or overnight.

Preheat grill to medium-high. Sear lamb on both sides, then lower heat and grill for 25–35 minutes, turning occasionally.

Rest 10–15 minutes before slicing against the grain.

Serve as a centerpiece, or with flatbread, salad, or grilled veggies.