Beef

Preheat oven to 400°F.
Heat the oil in a deep frying pan and fry the minced beef, breaking it up, until browned
Add the chopped onion and cook for 2–3 minutes
Stir in the tomato purée and cook for 2–3 minutes
Stir in the flour and cook for 1 minute
Add the mushrooms, beef stock and Worcestershire sauce
Bring to the boil, reduce heat, cover and simmer for 20 minutes
Set the meat mixture aside to cool, then turn it into a one-litre pie dish
Roll out the pastry on a floured work surface until slightly larger than the pie dish
Drape the pastry over the dish, press onto the edges, trim and shape the edges into a fluted edge
Cut leaf shapes from the pastry trimmings and stick them to the top with beaten egg yolk
Make slits to release steam, brush the pie with the remaining beaten egg yolk and bake for 20–25 minutes until golden brown
Slice into wedges to serve