Zaru soba is a popular Japanese summer dish made up of cold buckwheat noodles & tsuyu (soup base) After cooking and cooling noodles, serve with side bowl of tsuyu - dip noodles in soup base and eat! Easy, simple, refreshing, delicious! Buy with package of soba noodles and save! See soba noodle & tsuyu set Net Wt. 12.17 Fl. Oz.