Place the lamb, spices, fresh coriander, chilli, garlic, salt and pepper and egg into a food processor and blitz together. Using wet hands, roll the mixture into walnut-sized balls, then shape the balls around 8 metal skewers.
Heat the oil in an ovenproof frying pan, add the skewers and cook for 2–3 minutes on all sides, then transfer to a preheated oven, 220°C (425°F), Gas Mark 7, for a further 6–8 minutes until cooked through.
Meanwhile, to make the mint yogurt, mix together all the ingredients in a bowl.
Serve the koftas with a few salad leaves and the mint yogurt.