In a medium bowl, mix together sauce ingredients and set aside.
Set cut pork tenderloin in the bowl with sauce and let marinade.
In a wok or skillet, heat a tbsp of oil over medium-high heat. Using a slotted spoon, remove pork from the sauce and put it in the wok. Cook pork, stirring, until cooked through. Remove pork and place it in a bowl.
Add carrots and broccoli to the wok and cook for about 1.5-2 minutes. Add pepper and onion and cook until tender-crisp. Then add corn and peas and stir for another 30 seconds.
Return pork to the wok. Add the rest of the sauce into the wok and bring to a boil. Boil for 1-2 minutes. Add udon to skillet and stir until hot and covered with sauce for about 2-3 minutes.
Serve warm, garnished with chopped peanuts.
Any vegetable can be used in this recipe.
When cooking carrots and broccoli, add a tbsp of water to help cook thoroughly.