Sauce a la Mornay

After reducing a good bechamel sauce (No. 409), stir into it incessantly a few spoonfuls of mushroom sauce (No. 392) and some raw cream, also essence of fish (No. 388), should this sauce be needed for fish; but if otherwise then use a few spoonfuls of good chicken stock (No. 195) reduced to a half-glaze. When the sauce becomes succulent and creamy, pour it into a small saucepan, beat it smooth while heating it, and finish it off of the fire with some butter and grated parmesan cheese. This sauce is used for dishes that are bread-crumbed and for meats baked by a salamander. Its delicacy forbids it being boiled.