Marinate beef in oyster sauce, seasoning soy sauce, sugar and pepper. The longer time, the better.

In a pan, put it in butter, saute garlic, onion and ginger.

Add in beef, saute for 2mins. Then add water until beef is tender.

There should be a little water left then add the marinate. Season with salt, pepper and sugar. Let it simmer.

Add the brocolli. Cover for atleast 2mins

Mix cornstarch in water, then add to the beef. Cover for another 2mins until sauce becomes thick. Serve.