STRIPED BASS À LA DAUPHINE

Clean and trim a striped bass. Put into a fish-kettle with salt, pepper, a bunch of parsley, a pinch of sweet herbs, a sliced onion, two cupfuls of white wine, two cupfuls of water, and four tablespoonfuls of butter. Cook for forty minutes in a moderate oven, basting frequently. Drain the fish, strain the liquor, and add enough white stock or oyster liquor to make the required quantity of sauce. Cook two tablespoonfuls of flour in one tablespoonful of butter, add the liquid, and cook until thick, stirring constantly. Add three egg yolks well beaten with four tablespoonfuls of butter, a tablespoonful of anchovy essence, the juice of half a lemon, and a pinch of paprika. Bring to the boiling point, pour over the fish, and serve. Garnish with fried mushrooms.