Take six large onions, cut them in slices, and put them in a stewpan,
with a quarter of a pound of the freshest butter. Set it in a stove to
simmer for an hour, covered up close; take the head, and with a knife
and fork pick all the fins you can get off the fish. Put this in a dish,
dredge it well with flour, and let it stand. Take all the bones of the
head and the remainder, and boil them on the fire for an hour, with an
English pint of water. Strain off the liquor through a sieve, and put it
to your onions; take a good large handful of parsley, well washed and
picked clean; chop it as fine as possible; put it in the soup; let it
just boil, otherwise it will make it yellow. Add a little cayenne
pepper, two spoonfuls of anchovy, a little soy, a little of any sort of
ketchup, and a table-spoonful of vinegar. Then put the fish that has
been set aside on the plate into the stewpan to the soup, and let it
simmer for ten minutes. If not thick enough add a small piece of butter
rolled in flour.
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