Preheat oven to 300F and line a baking sheet with foil.

Mix orange zest, cumin, smoked paprika, cinnamon, olive oil, salt, and pepper into a paste.

Rub the spice paste all over the lamb ribs.

Wrap the ribs tightly in foil and roast for 1.5 hours until tender.

Open the foil, raise the heat to 425F, and roast 20 more minutes to crisp the exterior.

Cut between the bones and serve hot.