It's Imo Youkan. A Japanese jellied sweets made out of sweet potatoes.
gobblegobbleAt the same time, dissolve some agar-agar into boiling water...grrrlllppImo YoukanLet's make some imo youkan!Take some round-cut and boiled sweet potatoes,'tateeeers!and push them through a strainer.Once the agar is all dissolved, add some sugar and bring to a rolling boil.Then, mix in the strained sweet potatoes.Put it all into a mold, and after it's cooled down from the cooking, put it into the freezer. After about 2 hours, it'll be done!snarfsnarf