How to make
Bisect the portions of fish fillets, sprinkle with salt and pepper, put them in boiling milk and boil on very low heat until almost tender.
Make a lightly fried mix of butter and flour, dilute it with milk, in which you boiled the and boil until get a smooth sauce, then add salt, sprinkle with pepper, add mustard and 5.3 oz (150 g) grated cheese.
Put the cooked fillets in an oiled baking dish, pour the sauce on, sprinkle with grated cheese and bake in a hot oven or grill for about 5 minutes.
