Alright, this might seem like a dumb question, but I love the concept of this cake, and have read many recipes for it all cautioning that omitting the nuts will stop the recipe from working and keep that tunnel from forming or remaining rather. I can't stand nuts, and have always wanted to make a nut free version of this cake, but have been reluctant to try. What makes the nuts crucial, and is there anything else to replace their function? I don't want to add another kind of nut, or fruit of any sort. I want a fudgy chocolate cake with a tunnel of sinful ooze... Any ideas?