Cut the beef brisket and vegetables into bite-sized pieces.
Make the marinade and mix it thoroughly with the beef brisket.
Heat cooking oil in a pan and stir-fry the beef brisket over high heat.
Add vegetables (onion, green onion, spicy chili peppers, etc.) and stir-fry together.
When all the ingredients are cooked through, turn off the heat and serve on a plate.