Creating this amazing Black Pepper Beef Udon is straightforward. Follow these steps for a delicious result:

1. Cook the Udon Noodles: Bring a pot of water to a boil, add the udon noodles, and cook according to package instructions. Drain and set aside.
2. Prepare the Beef: Marinate the sliced beef with soy sauce, oyster sauce, and black pepper for about 10 minutes.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Cook the Beef: Add the marinated beef to the skillet, cooking for about 3-4 minutes until browned. Remove the beef and set aside.
5. Sauté the Vegetables: In the same skillet, add the onion, bell pepper, garlic, and ginger. Stir-fry for 2-3 minutes until the vegetables are tender.
6. Combine Ingredients: Return the beef to the skillet, and add the cooked udon noodles. Toss everything together, ensuring the noodles are well-coated with the sauce.
7. Finish with Sesame Oil: Drizzle sesame oil over the dish, and stir to combine.
8. Garnish: Remove from heat, and garnish with chopped green onions and sesame seeds.
9. Serve: Plate the Black Pepper Beef Udon and enjoy your delicious creation!