Fillet the fish, wash and dry them; put them on to a baking sheet, sprinkle with lemon juice. Put a few little pieces of butter over them; cover with buttered paper and bake from 20 minutes to half an hour, according to the thickness of the fillets. Place them carefully on the dish in which they are to be served, pour over them the cheese sauce nicely flavoured with pepper, salt, and parsley. Sprinkle over them some dry cheese, brown in front of the fire, or under the grill if using a gas stove, and serve hot.
Time: 25 minutes.