Leftover lamb shepherd’s pie

Method

1. Heat the oven to 200°C/fan180°C/gas 6. Heat the olive oil in a large frying pan, then gently cook the onion, carrots, celery and garlic for 10-12 minutes until tender.
2. Add the thyme and red wine, then simmer for 2-3 minutes. Add the leftover lamb, stock, Worcestershire sauce, ketchup and tomato purée, then season. Simmer gently for 15 minutes until the mixture has reduced.
3. Put the potatoes in a large pan of cold salted water, bring to the boil, then simmer for 12 minutes or until tender when pierced with a fork. Drain, return the potatoes to the pan and mash until smooth. Beat in the butter and egg yolks, then stir through the grated parmesan.
4. Spread the lamb mixture in a 1.5 litre ovenproof dish and top with the mash. Sprinkle over a little extra parmesan and season. Bake in the oven for 20-25 minutes until golden on top and bubbling.