I saw a tutorial on how to make a topsy turvy cake. They showed that they put one cake directly on top of the other, without any cardboard in between or anything. I've tried that a couple times, and it works OK, but the fondant on the bottom layer that is in between the two cakes gets soft and mushy. Honestly I think it tastes better that way lol, but it's not very attractive.
So, should there be a separation between layers?
So, should there be a separation between layers?