How to Make It
Preheat the oven to 425°. In a small skillet, toast the saffron over low heat just until fragrant, 1 to 2 minutes. Transfer the saffron to a small bowl and crumble between your fingers. Add the butter, garlic, the 1 tablespoon of cumin, the coriander, turmeric and ginger and mix well.
Set the lamb in a large baking dish fat side up and rub all over with the spiced butter. Season with salt and roast for about
30 minutes, until the meat is golden brown. Reduce the oven temperature to 325°.
Add the rosé to the baking dish, cover with foil and roast for about 3 hours longer, basting occasionally, until the lamb is
falling-off-the-bone tender. Transfer to
a cutting board and let rest for 10 minutes. Carve and serve with harissa and cumin for dipping.