Oyster sauce
To a white roux of butter and flour add a cupful of boiling liquid made by cooking a dozen oysters in hot water for two minutes. Drain the oysters (which should be very small) and keep warm while you stir the thinned roux to a smooth cream, and season it with a dash of cayenne, a teaspoonful of lemon juice and a little salt. Boil one minute, put in the oysters and take at once from the fire.