Throw a handful of salt into a pot of boiling water. When it boils
very hard, put in the prawns. Let them boil a quarter of an hour,
and when you take them out lay them on a sieve to drain, and then
wipe them on a dry cloth, and put them aside till quite cold.
Lay a handful of curled parsley in the middle of a dish. Put one
prawn on the top of it, and lay the others, all round, as close as
you can, with the tails outside. Garnish with parsley.
Eat them with salt, cayenne, sweet oil, mustard and vinegar, mixed
together as for lobsters.