Finely chop the beef, tofu, and green onions.
Heat cooking oil in a pan and stir-fry the beef.
Add garlic and green onions, and stir-fry.
Add tofu and gently mix and stir-fry together.
Add seasonings such as gochujang, soy sauce, and doubanjiang, and mix well.
Add water and chili powder, then bring to a boil.
Finish by adding sesame oil and black pepper.