Slice your beef at an angle to 1/4" wide strips and marinate for 20 minutes with salt, white pepper, baking soda, shaoxing wine, light soy sauce, cornstarch, and neutral oil.
Premix the sauce in a bowl by combining light soy sauce, dark soy sauce, oyster sauce, sugar, white pepper, sesame oil, MSG, chicken stock, and cornstarch.
Mince garlic and ginger, and cut broccoli into 1" pieces. Blanch the broccoli in boiling water for 1 minute, drain well and set aside.
In a large pot of boiling water, cook your lo mein noodles for 1 minute less than package directions, drain and set aside.
In 4 tbsp of neutral oil over high heat, fry your beef for 2-3 minutes and remove. In the same oil, fry garlic and ginger for 15 seconds followed by your broccoli and stir fry for another 30 seconds over high heat.
Add back your beef, noodles, and pour in your sauce. Mix and continue cooking over high heat until the sauce has thickened (about 1-2 minutes). Enjoy!
Notes
Undercook the noodles - Don't forget that the Beef and Broccoli Noodles will finish cooking in the pan! I always cook my lo mein noodles 1-2 min less than the package instructions call for. This way, they come to my preferred doneness by the time the dish is done in the pan!Cut the broccoli into similar sizes - Cutting your broccoli into similar sizes ensures that they will cook to the same level of doneness. Even though it's one additional step, I always recommend doing so - the finish product will be worth it!Blanch the broccoli first! - Similarly, I know blanching your broccoli for only a few seconds seems like an unnecessary waste of time - but I assume you, this step is crucial to soften the broccoli (while still keeping it crisp in the final dish)! Do not skip the blanching!If you can't use a wok, you can use a large pan, cast iron, or even a dutch oven. Avoid crowding - crowding can lead to your Beef and Broccoli Noodles not cooking thoroughly and becoming mushy. If you think your dish will be crowded, use a larger pan, cast iron, or dutch oven, OR cook in batches.