Ingredients:
2 tablespoons olive oil
3 medium red onions, peeled and chopped
3 cloves garlic, peeled and chopped
2 carrots, peeled and chopped
2 sticks celery, trimmed and chopped
4 field mushrooms, peeled and sliced
1kg of stewing beef, cut into 2cm cubes
A few sprigs fresh rosemary, leaves picked and chopped
Sea salt
Freshly ground black pepper
440ml Guinness
2 heaped tablespoons plain flour
150g cheddar cheese, grated
170g ready-made puff pastry or 500g if you want a top and bottom to your pie
1 large egg, beaten

Method:
1. You can make the filling the day before if you wish. Preheat the oven to 190C/375F/Gas 5. In a large ovenproof pan, heat oil on a low heat. Add the onions and fry gently for about 10 minutes- try not to colour them too much. Turn the heat up, add the garlic, carrots and celery and scatter in the mushrooms. Mix everything together before stirring in the beef, rosemary, a pinch of salt and a level teaspoon of pepper.

2. Fry fast for 3-4 minutes, then pour in the Guinness, stir in the flour and add just enough water to cover. Bring to a simmer, cover the pan with a lid and place in the preheated oven for about 11⁄2 hours. Remove the pan from the oven and give the stew a stir. Put it back into the oven and continue to cook it for another hour, or until the meat is very tender and the stew is rich, dark and thick. A perfect pie filling needs to be robust, so if it's still quite liquidy, place the pan on the hob and reduce until the sauce thickens. Remove from the heat and stir in half the cheese, then season carefully and leave to cool slightly.

3. Dust a clean work surface with flour and roll the pastry out evenly with a floured rolling pin to the thickness of a pound coin. Tip the stew into your dish and even it out before sprinkling over the remaining cheese.

4. Place the pastry over the top of the pie dish and criss-cross it lightly with a sharp knife. Brush the top with beaten egg, then bake the pie directly on the bottom of the oven for 45 minutes, until the pastry is cooked, puffed and golden. Serve with vegetables of your choice.