In a bowl, combine beef slices with soy sauce, oyster sauce, shaoxing wine, vegetable oil, corn starch, and baking soda. Let marinate for 15-20 minutes.
8 oz flank steak, 1.5 tablespoon soy sauce, 1 teaspoon oyster sauce, 1 tablespoon Shaoxing wine, 1 teaspoon vegetable oil, 2 teaspoon corn starch, ½ teaspoon baking soda
For the fresh rice noodles, peel apart the noodles and separate gently. If stiff, microwave for 20-30 seconds to loosen.
1 pound fresh wide rice noodles (ho fun)
For the sauce, mix soy sauce, dark soy sauce, oyster sauce, sugar, corn starch, white pepper, and water in a small bowl. Set aside.
3 tablespoon soy sauce, 2 tablespoon dark soy sauce, 2 tablespoon oyster sauce, 1 teaspoon granulated sugar, 1 teaspoon corn starch, Dash of white pepper, 1 tablespoon water
Heat 1 tablespoon oil in a wok or pan over high heat. Add the beef and stir-fry for 45 seconds to 1 min until just browned. Remove and set aside.
Vegetable oil
Add another 1 tablespoon oil. Stir-fry garlic and onion for 20 seconds until fragrant. Add noodles, then pour the sauce over. Toss gently to coat until noodles completely.
3 cloves garlic, ½ small onion
Return the beef to the wok. Add green onions, bean sprouts, and a pinch of salt. Stir-fry for another 30 seconds until everything is well mixed and noodles have softened. Avoid over-stirring to prevent breaking the noodles. Transfer to a plate and serve hot!
3 green onions, 1.5 cups bean sprouts, Pinch of salt to taste