Cut the beef against the grain in medium slices. Wash and strain the blood out of the meat.
Make the sauce by mixing baking soda, oyster sauce, light soy sauce, water, cornstarch, white pepper, sugar, and cooking wine.
Add the beef to the marinade and massage to have the meat fully covered with the marinade. Set aside and let it sit for 30 mins.
Cut the broccoli into bite-size pieces.
In a small bowl, mix together the oyster sauce, light soy sauce, dark soy sauce, water, cooking wine, sugar, cornstarch, and white pepper.
Boil the broccoli with a little bit of oil and salt and cook it to your preference. Drain once cooked.
Add some cooking oil into the marinated beef and mix until all the meat is lightly coated in oil.
Add the remaining oil and stir-fry the sides.
Add the sauce to the stir fry and constantly mix for about 1 minute. Add sesame oil. Once everything is incorporated, add a little more leftover oil to coat the broccoli — it will make it look very appetizing.
Taste to adjust the flavors and plate once it's to your taste!
