OYSTER SAUCE IS MADE THUS
(The Art of Cookery, 1805)
Take a half a pint of oysters, and simmer them till they are plump, strain the liquor from them through a sieve, wash the oysters very clean, and beard them; put them in a stew-pan, and pour the liquor over them, but mind you do not pour the sediment with the liquor;
then add a blade of mace, a quarter of a lemon, a spoonful of anchovy liquor, and a little bit of horse-radish, a little butter rolled in flour, half a pound of butter nicely melted,
boil it up gently for ten minutes; then take out the horse-radish, the mace, and lemon, squeeze the juice of the lemon into the sauce, toss it up a little, then put it into your boats or basins.