Let’s get cooking! Follow these steps to whip up this comforting dish:

1. Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat. Add the thinly sliced beef and cook until browned, about 5 minutes. Remove the beef from the skillet and set aside.
2. In the same skillet, add the remaining tablespoon of oil. Stir in the onion and bell pepper, cooking until they are just tender, about 3-4 minutes.
3. Add the minced garlic to the skillet and sauté for another minute until fragrant.
4. Return the beef to the skillet. Stir in the soy sauce, oyster sauce, black pepper, and sugar. Mix well, letting the flavors meld together, about 2 minutes.
5. Add the udon noodles to the skillet, tossing to combine with the beef and vegetables. Cook for an additional 2-3 minutes until everything is heated through.
6. Taste and season with salt if needed. Garnish with green onions if desired.

Remember, cooking is about love and creativity. Don’t be afraid to adjust the seasoning to fit your family’s taste buds. That’s what makes it your recipe.