Slice the beef into thin strips against the grain. Place the sliced beef in a small bowl with baking soda, corn starch, soy sauce, and oil. Set aside to marinate for 30 minutes.
Prepare the lo mein sauce by combining the soy sauce, oyster sauce, dark soy sauce, sesame oil, salt, sugar, and ground white pepper in a small bowl.
If using cooked lo mein noodles, rinse them under hot tap water to loosen them and drain thoroughly. If using uncooked noodles, cook them according to package instructions until they’re al dente, and drain thoroughly. Set aside. Prepare the garlic and all the vegetables to have them ready for cooking.
Place your wok over high heat until it’s smoking lightly. Add 1 tablespoon of vegetable oil to coat the wok, and add the beef. Sear each side for about 30 seconds. Remove the beef from the wok and set aside.
Add another tablespoon of oil, along with the garlic, carrots, peppers, and mushrooms. Stir-fry for 30 seconds.
Add the bamboo shoots and the white parts of the scallions. Stir-fry for another 20 seconds, and then add the napa cabbage. Stir-fry everything together for another 30 seconds.
Add the prepared noodles. If they are stuck together, rinse them in hot water to loosen them up.
Add the Shaoxing wine around the perimeter of the wok, and toss the vegetables and noodles together using a scooping motion. After the noodles are warmed up and add your pre-mixed sauce.
Continue stir-frying with a scooping motion until the sauce is evenly distributed. High heat and a well-seasoned wok should prevent any sticking.
Add the snow peas, mung bean sprouts, and beef (along with any juices that may have collected in the bowl). Continue stir-frying until everything is thoroughly mixed.
Toss in the green parts of the scallions, and taste the lo mein. Adjust the seasoning to your liking. Plate and serve with homemade chili oil or hot sauce on the side!