PLAIN DRESSING.
Beat one egg very light; add one tablespoonful of vinegar and cook in double boiler until thick; place one tablespoonful of butter in a bowl and pour the hot custard over it; beat until smooth, then add mustard and salt to taste—one half teaspoonful of mustard, and saltspoonful of salt is the usual proportion,—with half a teaspoonful of sugar to blend. Set away to cool. Just before using, add sufficient sweet cream to thin to the consistency of rich cream.