Wash the beef brisket and soybean sprouts thoroughly.
Slice the onion and green onion.
Add the beef brisket to a pan and stir-fry.
When the fat is rendered, add the onion and green onion and continue to stir-fry.
Add the soybean sprouts, cover the pan, and cook until done.
Add the sauce and stir-fry evenly.
Transfer to a plate and serve.