Begin by bringing a large pot of water to a boil, in which to cook the noodles.
While the water is heating up, make the sauce. Add all the sauce ingredients to a bowl, and whisk thoroughly. Set aside for now.
When the pot of water is boiling, add the soba noodles, and cook per package directions. Drain, rinse in cold water and set aside.
While the noodles are cooking, heat the sesame oil in a large skillet or wok, and add frozen stir fry vegetables and edamame. Stir fry the vegetables until they are thawed and crisp-tender.
Add the sauce to the skillet, stir, and simmer until thickened.
Add the noodles and toss to combine.
Garnish with green onions, and sesame seeds, or as desired.