2Marinate the Flank Steak: In a medium bowl, combine the sliced Flank Steak with 10 grams of Light Soy Sauce, 5 grams of Dark Soy Sauce, 10 grams of Shaoxing Wine, 1 gram of White Pepper, 2 grams of Sesame Oil, and all of the Cornstarch. Mix well to coat the beef evenly and let it marinate for at least 15 minutes.
3Prepare the Fresh Wide Rice Noodles by gently separating them with your hands to prevent clumping during stir-frying. If they are very stiff, a quick rinse under warm water can help, then drain very well.