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!