In a bowl, combine the sliced flank steak with baking soda, soy sauce, oyster sauce, Shaoxing wine, sugar, neutral oil, corn starch, salt, and white pepper. Mix until the beef is evenly coated, then let it marinate for 15 minutes while you prepare the other ingredients.
1 pound flank steak, 1 teaspoon baking soda, 2 tablespoon soy sauce, 1 tablespoon oyster sauce, 1 tablespoon Shaoxing wine, 1 teaspoon granulated sugar, 1 tablespoon neutral oil, 1 tablespoon corn starch, ¼ teaspoon salt, Dash of white pepper
In a separate bowl, whisk together soy sauce, dark soy sauce, Shaoxing wine, oyster sauce, sugar, beef broth, and corn starch until smooth. Set aside.
3 tablespoon soy sauce, 1 tablespoon dark soy sauce, 1 tablespoon Shaoxing wine, 2 tablespoon oyster sauce, 2 teaspoon granulated sugar, ¾ cup low-sodium beef broth, 1 tablespoon corn starch
Bring a medium pot of water to a boil. Add the broccoli florets and cook for about 30 seconds until bright green. Quickly transfer them to an ice bath to stop the cooking process, then drain and set aside.
1 pound broccoli
Heat a large pan or wok over medium-high heat with 1 tablespoon neutral oil. Add the marinated beef in a single layer and sear until browned on both sides and mostly cooked through. Remove and set aside.
2 tablespoon neutral oil
In the same pan, add another 1 tablespoon of oil. Sauté the minced garlic and ginger until fragrant, about 30 seconds. Pour in the stir-fry sauce and let it simmer for about a minute, stirring constantly until slightly thickened.
4 cloves garlic, 1 tablespoon minced ginger
Return the seared beef and blanched broccoli back into the pan. Toss everything together until the beef is fully cooked and the sauce coats each piece evenly, about 1-2 minutes.
Finish with a touch of sesame oil and a pinch of salt to taste. Serve hot with steamed rice.
1 teaspoon sesame oil, Pinch of salt