Thanks for the answer! Wow that is quite the hack!
I think I got the logic behind it, and was trying to implement it, but i´m runnning into an issue. This third level list is not showing at first (and icons+counter not visible) because when you access the screen there is no OrderItem created yet, so nothing is shown. Do I have to create one order item per menu item at first? how would I do that? I craeted this diagram to illustrate what I understood, please tell me if im correct.
