Preheat oven to 350.
For the Cake Combine cake mix and cocoa in a large mixing bowl. Add water. Beat for 1 minute on low, until just combined. Beat for 1 minute more on medium speed. Pour batter into an ungreased tube pan. Bake according to the package instructions. (About 40-45 min)
Remove pan from the oven and tip upside over a glass bottle to cool. Allow the cake to cool completely.
To remove the cake from the pan gently run a knife around the side and center of the cake to release. Tip the cake pan over onto a serving plate and gently tap the bottom.
For the Ganache: Warm the cream and butter in a medium saucepan over low heat. Whisk in the powdered sugar and cocoa powder until smooth. Remove from the heat and add vanilla. Mix well.
Drizzle ganache over cake and serve with fresh berries. 12 servings