75²µ/2Β½΄Η³ϊ mushrooms, chopped
1 onion, chopped
1 tbsp tomato purΓ©e 1Β½ tbsp plain flour, plus extra for dusting
dash Worcestershire sauce
250ml/9fl oz stout or beef stock
2 tbsp vegetable oil
1 free-range egg, yolk only, lightly beaten
400g/14oz ready-made shortcrust pastry
500g/1lb 2oz beef mince