Cut the tofu and pork into bite-sized pieces.
Slice the onion and green onion.
Heat cooking oil in a pan and stir-fry the green onion until fragrant.
Add the pork and stir-fry over medium heat.
When the pork is mostly cooked, add the onion and tofu.
Season with soy sauce, red pepper powder, minced garlic, and black pepper.
Stir-fry until all the ingredients are cooked evenly.
Transfer to a dish to finish.