I slice up some beef and add some soy sauce and black bean sauce, then stirfry it briefly. Remove it from the pan.
I toss chopped garlic and ginger in some hot neutral oil and then add the broccoli and sliced onion. After getting it hot I add some water and soy sauce for steam and cover for a few, then add the cow and a bit of corn starch in water to thicken, but that last is optional.
Hoisin is another option for black bean sauce. A little dry sherry works too.