I went to the grocery store yesterday to buy chocolate, and only chocolate, for this cake recipe. I have Molly's book -- A Homemade Life -- and the recipe is in there, too. So, I'm not sure what took me five years to make it, but man, I am an idiot.
If I was smart, I would have just tried it first thing. I encourage you to do that right now. Go get your chocolate, and don't waste any time!
I baked this in what must be a 10-in. round cake pan, and it baked in 20 minutes flat. Which was great, because I had a craving that would not be tamed. I had to bring the rest into work to avoid temptation.
I'd post a picture of the finished product, but I think it's all gone now. :)