Mix the garlic, onion, spices, oil and lemon juice together thoroughly in a bowl, then add the lamb chops and turn to coat them really well. Cover and leave for an hour at room temperature or overnight in the fridge.
When you are ready to cook the lamb, mix the cumin, paprikas and salt together in a bowl. Sprinkle the lamb liberally with half the spice mixture. Place the chops under a h