If your lamb is not very lean you may end up having flare-ups on the grill. If this happens while you are grilling the kofta, turn off one of the burners, and set the skewers over the extinguished side of the grill. Close the lid and use indirect heat to finish cooking them. For a charcoal grill, move the kofta to the edges of the grill grate, over a section where there isn't any charcoal below.