Cook rice in a steamer.
Prep:
Cut steak into thin 3 inch strips.
Combine soy sauce, brown sugar, ginger and remaining cornstarch and water until smooth;
Cook:
In a wok over medium high heat, add 2 tablespoons oil garlic and ginger, cook for 1 min.
Add beef and cook until beef is nearly done.
Stir-fry broccoli and onion in remaining oil for 4-5 minutes.
Add soy sauce mixture to the pan.
Cook and stir for 2 minutes.
Serve over rice.