100g/3陆oz button mushrooms, finely chopped
1 tbsp dried thyme
1 tbsp Worcestershire sauce
1 tbsp Tabasco sauce
salt and freshly ground black pepper
30g/1oz butter
1 free-range egg, beaten
450g/1lb ready-rolled puff pastry
450g/1lb sausage meat (you can easily push the meat out from the skins of readymade sausages)