Mix together the lamb, cumin, thyme, chilli powder and lemon rind in a bowl and season well. Divide the mixture into 8 and shape around 8 metal skewers.
Place the skewers under a hot grill or on the barbecue for about 6–7 minutes, turning occasionally, until golden and cooked through.
Combine all the tzatziki ingredients in a serving dish. Mix together all the salad ingredients in a serving bowl.
Serve the kofte with the tzatziki, red onion salad and toasted gluten-free bread or steamed rice, if liked.