Whish together stir-fry sauce ingredients in a small bowl & set aside.
Udon Noodles
Place udon noodles in a bowl & fill it with hot or boiling water. Let noodles sit until they are easy to detangle. Then drain & set aside.
Cooking
Preheat half of the vegetable oil in a saucepan over medium heat. Sear the shrimp until they are cooked through (5-8 minutes depending on the size). Remove them from the pan & set aside.
Add more oil to the pan & sauté garlic & green onions until fragrant. Add the cabbage, carrots, mushrooms & peas. Sauté until vegetables start to soften.
Add the udon noodles, cooked shrimp & stir-fry sauce to the pan, Toss & sauté for another 2-3 minutes. Serve.