Mayonnaise Sauce. Time—½ hour.
1 yolk of egg, pepper and salt to taste, 1 gill sweet oil, tarragon vinegar.
Beat up yolk and seasoning; drop in the oil very gradually, stirring all the time, so that the paste gradually thickens. Mix to a thick cream with tarragon vinegar.
Tartare Sauce is made by the addition of 1 dessertspoonful chopped capers, 1 teaspoonful finely chopped parsley, 1 teaspoonful made mustard, or a pinch of cayenne.