Begin by cooking the udon noodles according to the package instructions. Drain and set aside.
In a large skillet or wok, heat the vegetable oil over medium-high heat.
Add the minced garlic and grated ginger to the skillet and sauté for 1-2 minutes until fragrant.
Toss in the sliced red bell pepper, broccoli florets, and julienned carrot. Stir-fry for 3-4 minutes, until the vegetables are just tender.
Add the cooked udon noodles to the skillet, followed by the soy sauce, oyster sauce, and black pepper. Toss everything together until the noodles are well coated and heated through.
Drizzle with sesame oil and mix once more.
Remove from heat and stir in the chopped green onions.
Serve hot, garnished with sesame seeds for an added crunch.
Notes
Adjust black pepper to taste for desired spiciness.