Directions:
To one gill of boiling water add as much milk; stir into this while boiling two tablespoonfuls of butter gradually, one tablespoonful of flour wet up with cold water; as it thickens, the chopped yolk of one boiled egg, and one raw egg beaten light. Take directly from the fire, season with pepper, salt, a little chopped parsley and the juice of one lemon, and set covered in boiling water (but not over fire) five minutes, stirring occasionally. Pour part of the sauce over fish when dished; the rest in a boat. Serve mashed potatoes with it.