1 1/2 cup flour, unbleached, sifted 3 tablespoons baking cocoa 1/2 teaspoon salt 1 tablespoon vinegar 1 cup water 1 cup sugar 1 teaspoon baking soda 1 teaspoon vanilla extract 5 tablespoons butter or regular margarine ***MOCHA CHOCOLATE FROSTING*** 1 3/4 cup confectioners' sugar 3 tablespoons butter or regular margarine 1/2 teaspoon vanilla extract 3 tablespoons baking cocoa 3 tablespoons Coffee; Brewed, Hot
Sift the flour, sugar, cocoa, baking soda, and salt together into a mixing bowl. Make 3 wells in the dry ingredients. Pour vanilla into 1 well; vinegar into 1 well and melted butter into the third. Pour water over all. Beat with a wooden spoon until well blended.
Pour batter into a greased 9-inch square baking pan. Bake in a preheated 350 degree F. oven for 25 minutes or until cake tests done. Cool in pan on rack. Frost with Mocha Chocolate Frosting. Cut into squares.
MOCHA CHOCOLATE FROSTING: Combine confectioners' sugar, cocoa, softened butter, coffee, and vanilla in a mixing bowl. Beat, with an electric mixer set at medium speed, until smooth.