Cook your soba noodles according to package (around 3-5 minutes).
Drain your soba noodles and rinse with cold water. Add a few ice cubes, while stirring, to completely chill the noodles. Set aside until ready to serve.
In a quart container, add your mushroom broth, soy sauce, algae oil, rice wine vinegar, sugar, sesame oil, and Kewpie mayo. Mix with a whisk and stir until thoroughly combined.
To serve, add noodles and veggies to a shallow bowl, then pour your broth on top. Top with sesame seeds. Enjoy!