Cut the beef brisket and vegetables into bite-sized pieces.
Add cooking oil to a pan and stir-fry the beef brisket.
When the meat is halfway cooked, add vegetables such as onion and green onion, and continue stir-frying.
Season with soy sauce, sugar, minced garlic, and pepper.
Once all ingredients are cooked through, turn off the heat and drizzle sesame oil.
Transfer to a plate and sprinkle with sesame seeds to finish.