Red Devil Magic Mayonnaise Cake This novelty cake of the 1950s became a popular conversation-piece dessert. Mayonnaise replaces eggs and oil in the recipe. 2 cups all-purpose flour 1 cup real mayonnaise 1 cup granulated sugar 1 cup cold water (or cold coffee for mocha-flavor cake) 1/3 cup cocoa powder 2 teaspoons baking soda 1/2 teaspoon salt Preheat oven to 350 degrees F. Combine all cake ingredients in bowl and whisk until very smooth. Pour into 2 greased and floured 8-inch round pans. Bake for 25 to 30 minutes, until wooden pick inserted in center comes out clean. Let cool 5 minutes in pan, then turn out and cool completely on wire racks. Fill and frost top and sides with Devil's Food Fudge Frosting. Devil's Food Fudge Frosting 3 cups confectioners' sugar 1/2 cup cocoa powder 1/2 cup (1 stick) butter or margarine, softened 3 tablespoons water or cold coffee 1 teaspoon vanilla extract Combine all ingredients in bowl and beat until smooth and creamy.