(here is the checkerboard effect when you cut it)
-1 cup butter
-1/2 cup shortening
-2/3 cup unsweetened cocoa powder
-4 cups confectioners' sugar
-4 tablespoons milk
-2 cups hot fudge topping
-2 teaspoons vanilla extract
2. Sift the cocoa with the confectioners' sugar and add to the creamed mixture. Mix together adding 1 tablespoon at a time of milk to keep mixture smooth. Don't add more than 1/4 cup of milk.
3. Add the hot fudge topping and the vanilla extract. Blend until smooth and creamy.