Step 1

Preheat the oven to 350 degrees F. Grease a 10-inch tube pan with butter.

Step 2

Sift the flour, baking powder, salt and cocoa together. Set aside.

Step 3

With an electric mixer, cream the 1 cup butter, the shortening and the sugar until fluffy. Add the eggs one a time, beating well after each addition. With the motor running, add the flour mixture and the milk alternately, beginning and ending with the flour. Add the vanilla.

Step 4

Pour the batter into the prepared pan and bake for 1 hour. Check for doneness by inserting a toothpick into the cake; it should come out clean. Cool the cake in the pan for 30 minutes before turning it out onto a wire rack to cool completely.

Step 5

Slice the cake and serve topped with a scoop of vanilla ice cream.