Hiyashi Tororo Soba
Hiyashi Tororo Soba is cold soba noodles served in a bowl, with a bowl on the side that has in it puréed Yamaimo (aka Japanese Mountain Yam), and a raw egg.
You pour the puréed yam into the noodles and stir it all up to eat it.
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Hiyashi tororo soba (Japanese)