Add baking soda and water to the sliced beef and massage with hands until all of the liquid is absorbed. Let stand 1-2 hours.
Rinse the beef thoroughly under running water until the water runs clear. Drain.
Add oil, oyster sauce/soy sauce, Shaoxing wine (optional), and cornstarch to the beef. Set aside to marinate for 15-30 minutes, and then your beef is ready to use.
Short-Cut method for Tenderizing beefAdd 1/8 teaspoon to 1/4 teaspoon (for tougher cuts) of baking soda and 1 to 2 tablespoons of water to the beef and mixing and working it into the beef before marinating will also do a fine job tenderizing!Follow step 3 and increase the marinating time for your beef at least 15 minutes.
How to Prepare Beef for Stir-fry by The Woks of Life. Recipe URL: https://thewoksoflife.com/prepare-beef-for-stir-fry/