Cut pork, tofu, onion, green onion, and garlic into bite-sized pieces.
Heat cooking oil in a pot and stir-fry the pork.
Once the pork is cooked, add garlic and onion, and stir-fry together.
Mash the pork with a spatula while stir-frying until it breaks apart.
Season with water, gochujang (Korean chili paste), red pepper powder, soy sauce, and salt.
Add tofu and mash as you stir and boil the stew.
Add green onion, bring to a boil one more time, and finish.