Take a gallon of stale strong beer, a pound of anchovies washed
from the pickle, a pound of peeled shalots or small onions, half
an ounce of mace, half an ounce of cloves, a quarter of an ounce
of whole pepper, three or four large pieces of ginger, and two
quarts of large mushroom-flaps rubbed to pieces. Put the whole
into a kettle closely covered, and let it simmer slowly till
reduced to one half. Then strain it through a flannel bag, and let
it stand till quite cold before you bottle it. Have small bottles
and fill them quite full of the catchup. Dip the corks in melted
rosin.
This catchup keeps well at sea, and may be carried into any part
of the world. A spoonful of it mixed in melted butter will make a
fine fish sauce. It may also be used to flavour gravy.