Slice beef against the grain: you may find lots of recipes asking to cut beef against the grain into 3mm (0.1-inch) thin slices. This is because this cutting technique can shorten the fibers and thus further prevent chewiness.
Marinate the beef
Mix beef with salt, white pepper, light soy sauce, dark soy sauce and oyster sauce. Mix well.
Add cornstarch and mix well. Then add around 1 tablespoon of oil, mix again to coat each piece of the beef. Set aside for 15 minutes.
Steam
Add approximately 200ml of water to your wok, then add the steamer rack and place the plate on top.
Place ginger and scallion whites on a plate. Then, try your best to spread the beef in a single layer using your hands or a pair of chopsticks.
You can stop here for a tender and juicy version—the sauce pairs well with steamed rice or noodles. Or continue heating for approximately 4 minutes, until the sauce is almost dry and thickened. This is our dry-steaming process. In this stage, there is no water in the wok. We are steaming with an empty wok.
Lastly, when the sauces are almost gone, add chili pepper and scallion sections. The further thickened sauce will give the beef a unique, smoky, and concentrated flavor, complementing that savory taste.