1 teaspoon butter
Mix ingredients in order given. Cook ten minutes in double boiler, stirring constantly. Cool before spreading.
Chocolate Filling
2½ squares chocolate
1 cup powdered sugar
3 tablespoons milk
Yolk 1 egg
½ teaspoon vanilla
Melt chocolate over hot water, add one-half the sugar, and milk; add remaining sugar, and yolk of egg; then cook in double boiler until it thickens, stirring constantly at first, that mixture may be perfectly smooth. Cool slightly, flavor, and spread.