Make English drawn butter and add to it, when done, the yolks of two eggs beaten with two tablespoonfuls of water; cook until thick and jelly-like, take from the fire and add one tablespoonful of tarragon vinegar or the juice of half a lemon.
ANCHOVY SAUCE
Rub two teaspoonfuls of anchovy essence with the butter and flour and then finish the same as English drawn butter.
SAUCE BECHAMEL
2 tablespoonfuls of butter
1 yolk of an egg
1/2 cup of milk
1 saltspoonful of pepper
1 tablespoonful of flour
1/2 cup of stock
1/2 teaspoonful of salt
Rub the butter and flour together, add the stock and the milk and stir until boiling; add the salt and pepper, take from the fire and add the beaten yolk of the egg, heat for a moment over hot water, and it is ready for use.
TARRAGON SAUCE
Add two tablespoonfuls of tarragon vinegar to an English drawn butter.
HORSERADISH SAUCE
Make an English drawn butter, and, just at serving time, add a half cupful of freshly grated horseradish. If you are obliged to use that preserved in vinegar, press it perfectly dry before using it.