Lay the fish in a baking dish and sprinkle salt and pepper over them.
Cover the fish with shrimp, mussels, sauteed mushrooms and place some around the fish, add the melted butter, lemon juice and wine and bake until done, 15 to 20 minutes.
Scald the cream and add to the beaten egg yolks and pour over the fish.
If sauce is still not thickened, a little cornstarch may be used.
Sprinkle with Parmesan and a little chopped parsley.