1. Soak the beef in clean water for 2 hours to remove blood
2. Cut the beef into 1 cm thick slices
3. Pat loose with the back of a knife on both sides
4. Add the beef to the soy sauce and marinate in oyster sauce for a while
5. Chopped onion
6. Add butter to the pan to melt
7. Add the marinated beef and fry
8. Turn over and fry
9. Add onions and sauté until broken
Tips:Put the steak in the pan and fry it over medium-high heat to lock the moisture in the steak. Fry it over low heat for about a minute, and it's almost done.
