What to do with a failed cake? Yesterday, my wife baked a cake. Unfortunately, it was a disastrous fail. Instead of fluffy and juicy it turned out to be a compact and painfully chewy mass (not to say mess). It is so compact that the raisins lying around started orbiting it. 

Now we were discussing on how to utilize it. Flushing it down the toilet is no option, since it is still food and we are worried about the damage it might cause to the pipes. The organic waste bin might be a way to dispose of it, however, I'd feel sorry about throwing out all the valuable ingredients. It basically consists of semolina, yogurt, quark, sugar, eggs, carrots and milk. 

Do you have any suggestion on what to do with it, eventually how to reuse it culinarily (chopping it is still possible, I got the right tools)?

EDIT:
Thank you everyone for your ideas. Dehydrating worked quite well. I added some of it into my crunchy Muesli mixture and I'm keeping some of it for the ice cream thing. Since it was quite a bit, farmer friends of ours were pleased to get the rest of it as chicken food. We got some fresh eggs in turn for baking a new cake.
...mix into ice cream...dry in low oven or dehydrator and use as "breadcrumbs"...use as struesel topping on another cake....??