In a small bowl, whisk together the ingredients for the gochujang sauce. Set aside.
Bring a large pot of water to a boil. Cook udon noodles according to package directions until al dente. Drain and rinse noodles under cold water.
In a large skillet or wok, heat the vegetable oil over medium-high heat. Add the sliced vegetables and green onions. Stir-fry for 4-5 minutes until starting to soften.
Add the cooked noodles and gochujang sauce to the skillet. Toss everything together until the noodles are fully coated.
Remove from heat. Transfer noodles to serving bowls and garnish with sesame seeds and extra sliced green onions.
Enjoy!
Notes
Use fresh or dried udon noodles. Cook fresh noodles for just 1-2 minutes.
Add any combination of sliced vegetables you desire.
For extra protein, add baked tofu, chicken, shrimp or pork.
Refrigerate leftovers up to 4 days. Reheat with a splash of water.