Slice beef thinly against the grain
Mix with 1 egg white
Add 1 tablespoon cornstarch per 1 pound beef
Add 1 tablespoon water or Shaoxing wine
Add 1 teaspoon oil
Add a pinch of salt
Mix until evenly coated
Marinate for 15 to 30 minutes
Heat water or oil until just below simmering or around 300°F
Blanch beef briefly for 30 to 60 seconds if using water
Stir-fry quickly if using oil
Remove as soon as the beef turns opaque
Drain well before cooking in the final dish