The page also has info about the donut and the Mister Donut chain.

Pon de Ring Donut Recipe ポンデリング • Just One Cookbook

Make your own Pon de Ring Donut at home just like Japan’s Mister Donut with my copycat recipe! They are soft, airy, bouncy, and chewy all at once with a unique mochi-like texture. Enjoy them with either a classic or matcha glaze.

I didn't put this in cooking because I don't know who good/bad the recipe is.