Cardinal Sauce for Fillets of Sole. (Mrs. Thomas.)
This sauce is also used for Lobster Boudins—see Fish.
Put a small piece of butter into a stewpan; when it has melted, add a tablespoonful of flour and mix well; next add ½ a pint of good stock (second stock will do), a small shallot, a little lobster spawn, a third of a teaspoonful of tarragon vinegar, the same of chilli vinegar and of essence of shrimps, and 1 table-spoonful of good thick cream.
After the cream you may add half a wineglassful of sherry, but it is a very doubtful improvement.
After adding the cream the sauce must not be allowed to boil; remove all fat and grease as it rises; then season with pepper and salt, and serve over and round the fillets.
(This red sauce, which should be a most beautiful colour, and rather thick, and Venetian Sauce No. 2, white, are the two best sauces for fillets of sole.)