I don't recall what grade I was in but we were reading a book and at the conclusion of one story the teacher asked a question from the story.  Supposedly the king offered a fortune or his daughter if somebody could create a food that was both hot and cold.

I answered the question but the teacher never admitted I was right.

I'll not tell you my answer in this post and request you not look at my next post until you've answered.  What food do you believe would have fulfilled the kings quest?