How to Make It
Mince 4 of the garlic cloves. In a small bowl, whisk minced garlic, pomegranate molasses, olive oil, salt, coriander, cumin, dill, sumac, Nine-Spice Mix, and cayenne until a smooth paste forms.
Using a paring knife, cut slits all over lamb. Rub spice mixture over lamb, pressing into slits. Smash remaining 4 garlic cloves. Tuck bay leaves and smashed garlic into 4 of the slits. Transfer lamb to a wire rack set in a large roasting pan. Refrigerate, uncovered, at least 6 hours or up to overnight. Let lamb stand at room temperature 1 hour before roasting.
Preheat oven to 425°F. Roast lamb, uncovered, in preheated oven until spice mixture just begins to brown, about 15 minutes. Remove lamb from the oven, and reduce oven temperature to 325°F. Add 1/2 cup water to roasting pan, and cover tightly with aluminum foil. Return lamb to oven, and roast at 325°F until tender and almost falling apart, about 3 hours, adding more water if necessary. (Water in pan may evaporate too quickly.)
Increase oven temperature to 425°F. (Do not remove pan from oven.) Uncover roasting pan, and continue to roast until top is browned, 5 to 10 minutes. Transfer lamb to a cutting board; tent with foil, and let rest 15 minutes. Pull meat into large chunks and serve.