Preparation

Step1: Prepare the Beef

1. Slice the beef thinly against the grain. This helps keep it tender when cooked.
2. In a bowl, mix the beef slices with soy sauce, oyster sauce, Shaoxing wine, cornstarch, sugar, baking soda (if using), and vegetable oil.
3. Let it marinate for at least 20 minutes (or up to 1 hour) to absorb the flavors and tenderize.

Step2: Prepare the Sauce

1. In a small bowl, mix soy sauce, oyster sauce, dark soy sauce, sugar, sesame oil, and white pepper.
2. Add the cornstarch slurry (cornstarch mixed with water) and stir well until everything is combined.

Step3: Heat the Wok and Stir-Fry the Onions

1. Heat 1 tablespoon of vegetable oil in a wok or large pan over high heat.
2. Add the sliced onions and stir-fry for about 2 minutes until they turn slightly translucent.
3. Add the minced garlic and ginger, and stir-fry for another 30 seconds until fragrant.
4. Remove the onions from the pan and set aside.

Step4: Stir-Fry the Beef

1. Add the remaining 1 tablespoon of oil to the hot wok.
2. Spread the marinated beef in a single layer and let it sear for 30 seconds without stirring.
3. Stir-fry for another 1-2 minutes until the beef is about 80% cooked. Avoid overcooking to keep it tender.

Step5: Combine Everything and Finish Cooking

1. Return the cooked onions to the wok and toss everything together.
2. Pour in the prepared stir-fry sauce and mix well to coat the beef and onions evenly.
3. Stir-fry for another 1-2 minutes until the sauce thickens slightly and everything is well combined.
4. Turn off the heat and garnish with chopped green onions and sesame seeds.