1 teaspoon mustard Few grains cayenne
1 teaspoon salt 1 teaspoon butter
2 teaspoons flour Yolk 1 egg
11/2 teaspoons powdered sugar 1/3 cup vinegar 1/2 cup thick cream, sweet or sour
Mix dry ingredients, add butter, egg, and vinegar slowly. Cook over boiling water, stirring constantly, until mixture thickens; cool, and add to heavy cream, beaten until stiff.
