Disc, Jade Disc
You offer a hot pepper to the king, and he gives you a drop of something. You look down at the drop to see it transforming into a disc. And not just any old disc at that. It's a jade disc. Have you ever seen ancient Chinese jade discs with holes in the middle? That's what this kanji is referring to.
You took a long time to pick out the perfect hot pepper. Only the best for the king, right? It burned your hands a little as you held it on your way to the palace. You were hoping for something pretty special in return, but you never imagined it would be a drop that magically turns into a disc. Wow!
へき
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Wait, did a drop really just change into a disc? What the heck is (へき) going on?
You start to realize just how crazy the situation is. Seriously. How the heck is a drop able to turn into a jade disc?