PERCH À LA NORMANDY
Prepare and clean the fish and put into a stewpan with a chopped onion, a bunch of parsley, a pinch of salt, and enough white wine to cover. Simmer for fifteen minutes, take up the fish, and strain the liquid. Add one cupful of oyster liquor and boil the liquid until reduced half. Take from the fire, add one tablespoonful of butter and two of flour, cooked together, stir until smooth, return to the fire, and cook until thick, stirring constantly. Take from the fire and add slowly the yolks of three eggs well beaten. Bring to the boil, pour over the fish, and serve.