250g/9oz chestnut mushrooms, cut into quarters
1 leek, cut in half lengthways and sliced
2 onions, quartered and sliced
225ml/8fl oz chicken stock
1 tbsp plain flour
75驳/2陆辞锄 plain flour
1 tsp black pepper
2 tsp salt
1 tbsp vegetable oil
1 tbsp butter
75驳/2陆辞锄 unsalted butter
220g/8oz cheddar, grated
1 free-range egg, beaten
2 sheets ready rolled puff pastry (320g/11陆oz each)
250ml/9oz single cream
6 chicken thighs, skinless and boneless