Jinenjo Soba Noodles This page first published: Jun 26, 2006 · Updated: Jun 9, 2018 · by CooksInfo. Copyright © 2021 · This post may contain affiliate links · This blog generates income via ads · Jinenjo Soba are soba noodles made from buckwheat, wheat and jinenjo flour (aka old Yamaimo flour.) They are usually served in a hot broth, or they can be used as a fried noodle.