Springtime shepherd's pie

2. Add the leeks, spring onions, carrots and celery to the meat. Cook, stirring, for about three minutes, until the vegetables begin to soften. Stir in the courgette, creme fraiche and lemon zest. Season to taste.

3 Heat the milk and 3/4 of the butter in a pan, add the potatoes and mash until smooth. Stir in the parsley and season with a little salt. Put the lamb mixture into an ovenproof dish and cover the meat with the mashed potato. Dot with the remaining butter and bake in the oven for 20 minutes, until golden.