Cottage Pie

Dice the onion, carrot and celery. In a heavy based frying pan over high heat, stir-fry them until soft (about 4min). Add the meat and garlic, stir for a further 4min until brown. Pour in the wine and let it reduce almost completely. Add the Worcestershire sauce, tomato puree, the herbs tied with a string (bouquet garni), the stock and bring it to a boil. Reduce the heat and simmer until the thickened. Season well with salt and pepper.

Boil the potatoes, skin on, until you can easily stick a knife through them. Strain, peel and mash with butter. Stir in the egg yolks and season with salt and pepper.

Pull out the tied herbs and spoon the meat into the bottom of an ovenproof dish. Layer the mash all over it and form peaks with a fork. Sprinkle it with the parmesan cheese and bake in a 180C/350F oven for about 20min, until golden.