Cut pork, onion, tofu, and kimchi into bite-sized pieces.
Heat oil in a pot and stir-fry the pork.
Add kimchi and onion, and continue stir-frying.
Add chili powder and minced garlic, stir-fry them together.
Pour in water and bring to a boil.
Add tofu and simmer over medium heat for 10 minutes.
Taste and season with salt or soy sauce as needed.
Slice green onion and add it in, cook for another 2-3 minutes to finish.