01 - Combine the sliced beef with soy sauce, cornstarch, Shaoxing wine, and oil in a bowl. Mix thoroughly and marinate for 10-15 minutes to tenderize.
02 - Whisk together light soy sauce, dark soy sauce, oyster sauce, sugar, and water in a small bowl until fully incorporated. Set aside for later use.
03 - Gently separate refrigerated rice noodles. If stiff, steam or microwave briefly to soften without breaking.
04 - Heat 1 tbsp vegetable oil in a large wok over high heat. Sear the marinated beef for 1-2 minutes until just browned. Remove from wok and set aside.
05 - Add another 1 tbsp oil to the wok. Stir-fry onions and most of the spring onions, reserving some for garnish, for 1-2 minutes until fragrant.
06 - Add rice noodles to the wok, spreading them evenly. Let sear undisturbed for 1 minute to develop a light char and enhance flavor.
07 - Pour the prepared sauce over the noodles and toss quickly to coat evenly, ensuring all noodles absorb the seasoning.
08 - Return the beef to the wok along with bean sprouts. Stir-fry everything together for 1-2 minutes until heated through and well combined.
09 - Garnish with reserved spring onions and serve immediately while hot for optimal texture and flavor.