Make the Lebanese spice mix first, simply mix all ingredients together and add 2tsp of salt to the mixture also. You can make this in large batches and it will keep in an airtight container.
In a mixing bowl, add the lamb cutlets, the tomato purée and garlic and cover the cutlets in the mixture then liberally sprinkle on the seven spice mix until the cutlets are well coated and leave to one side. You can also marinade this in advance if you like but it’s perfectly fine to cook at this stage also.