Onion and beef are perfect, plus oyster sauce, it is perfect.
I don't have beef, I use steak.
There is no beef at home, steaks used, beef slices, pulp, and there are many recipes for beef in the kitchen.
From the oil pan, first sauté the onion and sauté
Stir fry the beef, put the onion in the color white
Add oyster sauce, soy sauce, if you like the color is a little bit, add some soy sauce, stir fry the pot.
I didn't add salt, this is enough.