Sambi-Zu Sauce This page first published: Jun 29, 2004 · Updated: May 8, 2018 · by CooksInfo. Copyright © 2021 · This post may contain affiliate links · This blog generates income via ads · Sambi-Zu Sauce is a Japanese sauce made from rice vinegar, soy sauce and dashi (Japanese soup stock.) Sometimes, mirin and fresh finely-chopped ginger root are added as well. The sauce is boiled briefly, then let cool.