I made something new to me that is apparently a classic home made snack practically every mom makes for her kids in Hokkaido (northern-most area of Japan). Hokkaido, like Maine and Idaho ... and maybe Ireland, is known as potato-growing capitol of Japan, so this snack is made from potatoes and potato starch. And this is Japan, so of course the glaze/sauce is made with sweetened soy sauce.
It’s called Imo Mochi — which I guess loosely translates to Potato Dumplings.

...it was an instant hit — DH and DD1 devoured the first batch and she said I should make this often. I added some of the dumplings in a pork and potato/daikon stew and that was really good too, and reserved some shaped dumplings to pan fry and glaze later for DD2 (and DD1) and they were gone in no time at all.

I’ll post the recipe after I’ve had the chance to try making it a couple more times, but basically the dumpling is peeled, cubed, boiled potatoes, drained and heated to remove excess moisture, then mashed and kneaded with potato starch. Glaze is equal parts soy sauce and mirin, with a little less sugar (1:1:0.8 ), heated and thickened with water and tiny bit of potato starch.
Apparently, there are similar recipes/variations made with sweet potatoes and sweet potato starch, as well as kabocha... I wonder what kind of starch? Hm... maybe corn starch would be interesting? There is also something called "daikon mochi" — which I would imagine is completely different, but I want to look up recipes.