Cut the tofu into cubes.
Mince green onion, garlic, and ginger.
Heat cooking oil in a pan and stir-fry the minced pork.
Add minced garlic, ginger, and green onion, and continue stir-frying.
Add chili oil, Doubanjiang (fermented bean paste), and soy sauce, and stir-fry.
Add water and tofu, and bring to a boil.
Add starch water to adjust the thickness.
Finish with sesame oil and black pepper.