Yes, it has been done. In fact, I don't know how I missed this last year, to be honest. Bakers in Yorkshire have managed to bake an entire Christmas dinner (minus the turkey though, you'll be pleased to hear), into a cake. There are cranberries, chestnuts, carrots, parsnips and sprouts in there, as well as cinnamon, and a good amount of dark brown sugar.
The cake is sandwiched with a fill