Cut the beef into bite-sized pieces.
Prepare and slice vegetables such as onions and bell peppers.
Season the beef and vegetables with salt, pepper, and olive oil.
Heat oil in a pan and sear the beef over high heat.
When the beef is halfway cooked, add the vegetables and stir-fry together.
Add chop steak sauce (ketchup, oyster sauce, sugar, etc.) and mix well.
Cook until all ingredients are well done and the sauce is reduced.
Plate and garnish with toppings such as parsley.