This was very different from anything I have tried to make. I made as directed except used semi-sweet chocolate instead of the bittersweet because that is what I had. The texture was very surprising. It was kinda grainy, which suggest to me that I didn't process the mixture well enough. But it was powder when I finished. I will add that I am not very experienced in baking cakes or pies, so any problem I have with this cake is more than likely due to a technician error, and not the fault of the recipe. I would have liked a slightly sweeter version of this, especially for a chocolate cake. All in all not a bad cake, but if I'm going to eat chocolate cake, I prefer it sweet, since I don't do the sweet thing very often. Thanks for sharing.
I only leave a comment because I made a mistake and therefore can't rate the recipe above. I added the whole 9 ounces of chocolate to the cake mix with the result that my batter was extremely thick and very sticky and it was impossible to fold in the whisked egg whites. After having tried to fold in two thirds of the egg whites without success, I put it into the mixer. That way the batter was finally of a consistency to fold in the remaining egg white. However, it also meant that the batter was less airy because I disturbed all the air of a good part of the egg whites by using the electric mixer. My final cake (which I still glazed as I always keep a good stock of chocolate) turned out quite good. I cut the cake in very small pieces and served those with espresso. It's astonishing how much flavour the skin of a single orange can add. The combo of orange and cinnamon reminded BF and me of Christmas and I would have appreciated my cake even more in the winter. I think Kate's recipe would be in particular nice served with coffee after a dinner party around Christmas. I liked my idea of cutting the cake into tiny pieces, in particular as my variant had a very strong chocolate flavour. Thank you for posting a different chocolate cake, Kate.