1 1/2 cups cake flour
1 cup white sugar
3 tablespoons unsweetened cocoa powder
3/4 teaspoon baking powder
3/4 teaspoon baking soda
1/2 teaspoon salt
1 cup water
1/3 cup vegetable oil
1 tablespoon distilled white vinegar
1 teaspoon vanilla extract
1/2 cup unsweetened cocoa powder
1 (14 ounce) can sweetened condensed milk
2 tablespoons butter
Preheat oven to 175 degrees C. Grease and flour one 8 x 8 inch square pan.
Sift the flour, sugar, 3 tablespoons cocoa, baking powder, baking soda and salt together. Make a well in the center and add the water, oil, vinegar and vanilla. Beat until smooth and pour batter into the prepared pan.
Bake at 350 degrees F (175 degrees C) for 30 minutes.
To Make Frosting: Combine the 1/2 cup cocoa powder, sweetened condensed milk and butter in the top half of a double boiler and cook until thick. Spread warm mixture over the top of a slightly cooled cake.