- Sprinkle salt and pepper liberally on the beef slices and marinate with ingredients (A) for several hours.
- Heat oil in a wok and saute onions until soft. Add mushrooms and sauce ingredients and simmer for 10 to 15 minutes until gravy is thick.
- Dip beef slices in egg white and sprinkle lightly with cornflour. Fry beef slices in hot oil for three to four minutes until meat is tender. Drain.
- Add beef and tomatoes in the gravy and cook over high heat for one to two minutes. Remove and serve immediately.
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