Oyster Sauce.
WHEN the oysters are opened, preserve the liquor, and strain it through a fine sieve. Wash the oysters very very clean, and take off the beards. Put them into a stew pan, and pour the liquor over them. Then add a large spoonful of anchovy liquor, half a lemon, two blades of mace, and thicken it with butter rolled in flour. Then put in half a pound of butter, and boil it up till the butter is melted. Then take out the mace and lemon, and squeeze the lemon-juice into the sauce. Give it a boil, stirring it all the time, and put it into your sauce-boat.