Cut the small piece of beef tenderloin, use the back of the knife to loosen it, or drop it on the previous board, then use the egg white and the starch on the thick paste.
Pineapple cut into small pieces, ginger and garlic chopped
Heat the pan with hot oil and slide the beef off
Leave a little oil in the pot, add the ginger and garlic, and after mixing the scent, mix all the seasonings together and stir fry with the beef tenderloin.
Finally, put in the pineapple and stir fry a few times.