Start the mixer on low speed and mix until the sugar and cocoa are dampened by the cream then turn the speed up to high and mix for 3-4 minutes or until the cream is thick.
You may need to stop the mixer and scrape the sides of the bowl down at least once to make sure all the cocoa and sugar is incorporated into the cream.
Once the cream is thick, it is ready. Now, try not to eat it with a spoon. Good luck.