Prepare the beef. Slice the beef against the grain thinly.
Marinate. In a mixing bowl, combine the marinade sauce: with soy sauce, Chinese cooking wine or rice vinegar, cornstarch, black pepper, and baking soda. Mix everything until well blended then add the sliced beef. Marinate for a minimum of 30 minutes.
Make the sauce. In a small bowl, mix together the ginger paste, minced garlic, soy sauce, oyster sauce, cornstarch, sesame oil, and black pepper. Stir to dissolve the cornstarch. Set it aside.
Blanch the broccoli. Boil about 3-4 cups of water with a pinch of salt. Cook the broccoli florets for about 2 minutes. Take them out and dump them in cold water with ice to stop the cooking process.
Stir-fry the beef. Heat a wok over medium to high heat. Pour 2 tablespoons of cooking oil and let the oil in the wok slightly smoke. Stir-fry the beef until golden brown. Take them out and set them aside.
Cook the garlic. Using the same wok, pour 1 tablespoon of cooking oil. Saute garlic until aromatic.
In the same wok or skillet, add the sauce you prepared. Lower the heat to medium and let the sauce thicken.
Return the cooked beef and broccoli. Mix everything until well blended and stir-fry for 2 more minutes. Taste and adjust the seasoning according to your taste.
Serve your beef and broccoli with cooked rice. Enjoy!