Cut the beef tenderloin into bite-sized pieces.
Remove excess moisture from the tofu and fried tofu, and cut them into manageable pieces.
Heat oil in a pan and stir-fry the beef tenderloin.
Once the beef is cooked, add the tofu and fried tofu and stir-fry together.
Season with soy sauce, sesame oil, and black pepper.
Once all the ingredients are well combined, transfer to a plate.