Step1:Marinate the beef fillet with cornflour, egg white, sugar and cooking wine for a while; wash the mustard blue and cook it in the pot first. Stir fry with a small amount of salt and dish; mix oyster sauce and 1 tablespoon of water for use; marinate the beef fillet in the pot and stir fry it in high heat. Stir in oyster sauce and stir well. Put it on the mustard blue.
Cooking tips:There are skills in making delicious dishes.