Cut the beef brisket into bite-sized pieces.
Julienne the onion and green onion.
Heat oil in a pan and stir-fry the brisket.
When the brisket is halfway cooked, add the onion and green onion and stir-fry together.
Add soy sauce, oligosaccharide syrup, and minced garlic, then simmer.
Add pepper and sesame oil, and stir-fry one more time.
Serve in a bowl as a topping.