Mix one tablespoon of butter and one of flour in a saucepan and add gradually half a pint of boiling water.  Stir until it just reaches the boiling point; take from the fire and add the yolks of two eggs.  Into another saucepan put a slice of onion, a bay leaf, and a clove of garlic; add four tablespoons of vinegar, and stand this over the fire until the vinegar is reduced one-half.  Turn this into the sauce, stir for a moment; strain through a fine sieve; add half a teaspoon of salt and serve.  This sauce may be varied by adding lemon juice instead of vinegar, or by using the water in which the fish was boiled.  It is one of the daintiest of all sauces.

MUSTARD SAUCE

Mix two tablespoons of vinegar and one of mustard, one teaspoon of oil or butter melted, pepper and salt to taste.  Add this to two hard-boiled eggs chopped fine, with a small onion and about the same quantity of parsley as eggs; and mix all well together.

MAITRE D’HOTEL BUTTER

Work into one-half cup of butter all the lemon juice it will take, and add a teaspoon of minced parsley.

PICKLE SAUCE

Cream two tablespoons of butter, add one teaspoon of salt and one tablespoon of chopped pickle.  A speck of red pepper may be added.

SARDELLEN, OR HERRING SAUCE

Brown a spoon of flour in heated fat, add a quantity of hot fish stock and a few sardellen chopped fine, which you have previously washed in cold water, also a finely-chopped onion.  Let this boil a few minutes, add a little vinegar and sugar; strain this sauce through a wire sieve and add a few capers and a wineglass of white wine and let it boil up once again and thicken with the yolk of one egg.

SAUCE VINAIGRETTE

Rub the mixing bowl with a clove of garlic, add one-half teaspoon of salt, dash of white pepper, and a teaspoon of cold water or a bit of ice, then four tablespoons of oil.  Mix until the salt is dissolved, remove the ice and add ten drops of tabasco sauce, two tablespoons tarragon vinegar, one tablespoon grated onion, one tablespoon chopped parsley and one chopped gherkin.

ANCHOVY SAUCE

Mix six tablespoons of melted butter and one and one-half teaspoons anchovy paste, place in double boiler and allow to boil for about six minutes.  Flavor with lemon juice.

SAUCE PIQUANTE

To one pint of drawn butter add one tablespoon each of vinegar and lemon juice and two tablespoons each of chopped capers, pickles, and olives, one-half teaspoon onion juice, a few grains cayenne pepper.

SAUCE TARTARE