350g/12oz mixed mushrooms (such as button, chestnut, wild), thinly sliced
100g/3陆oz button mushrooms, finely sliced
1 tbsp finely chopped tarragon
1 tbsp freshly chopped tarragon
2 tsp Dijon mustard
1 tbsp Dijon mustard
plain flour, for dusting
1 tbsp plain flour
salt and freshly ground black pepper
1 tbsp oil
a pinch sugar
large knob of butter
small knob of butter
400ml/14fl oz full-fat cr猫me fra卯che
1 egg, beaten with a dash of milk
1 egg yolk
50驳/1戮辞锄 Parmesan, finely grated
1陆 x 375g packets all-butter puff pastry
1.3kg/2lb 14oz middle-cut fillet of beef