Combine the marinade ingredients in a shallow dish. Add the lamb, and cover and refrigerate for 4 to 6 hours.
Prepare the barbecue for direct cooking over medium heat (180° to 230°C).
Drain the lamb and reserve marinade. Pour the reserved marinade into a small saucepan and bring to the boil for 1 full minute.
Arrange the lamb onto skewers. Cook the lamb over direct medium heat, with the lid closed, for about 5 minutes on each side, basting with the boiled marinade once during cooking.
Arrange the lamb onto skewers. Cook the lamb over medium heat, with the lid closed, for about 5 minutes on each side, basting with the boiled marinade once during cooking.
