I recently needed to make some black fondant and was told the best way to achieve this was to start with brown chocolate fondant. To make chocolate fondant you were supposed to remove 1 cup of icing sugar from the recipe and replace it with 1 cup of cocoa.
I did this...what a mess! It was crumbly, could not mold it together. When I finally got a small amount together and rolled it out it was dried out and fell apart everywhere?
Any suggestions on how to make a great chocolate fondant?
I wish I could help, but really I am looking for the same answer. My chocolate fondant was fine until I tried rolling it out. Then I had the same problems as you. It had absolutely no stretch to it, and would not go on the cake.
On the up side, it tasted fantastic!
Sorry to hear you had such trouble............there is a recipe here called Rhond'as Ultimate Chocolate MMF, and it is AWESOME!!!!!
The first time I made it, it had me speechless..........it tastes just like a Tootsie Roll, and is soooooooooo easy to work with!!!!
Try it, you'll be amazed!!!!!!! 
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