A Karumeyaki Demonstration!

This video shows karumeyaki being made at a stall near the Japan Mint in Osaka Prefecture.

Karumeyaki, also known as karuyaki, etc., is a traditional Japanese snack that looks like a large, puffy disk.
From 1:10 in the video, you can see the vendor add granulated sugar and watch it swell.

The taste you'll notice is caramelized sugar with a slightly charred taste and a macaron-like texture.
You don't see karumeyaki stalls very often, but you can find demonstrations at festival and fair stalls, so if you see one, be sure to give it a taste!