If you plan to freeze some of the koftas: Shape the Moroccan lamb kofta as described above, but do not use the skewers. Place the patties on a baking sheet lined with parchment paper, leaving 1/2 inch between them. Freeze overnight. Transfer the patties to a freezer bag and label. To grill the kebabs, defrost overnight in the refrigerator, thread the patties on the skewers and grill as described above.