Required: Half a pint of mayonnaise sauce. One tablespoonful of Bechamel sauce. Half a tablespoonful of chopped gherkins. One teaspoonful each of chopped parsley and capers. Half a teaspoonful each of chopped tarragon and chervil. A pinch of castor sugar.
N.B.-If more convenient, use plain white sauce or cream in place of Bechamel sauce.