Cut the pork belly into bite-sized pieces.
Chop the kimchi and onion.
Put the pork belly in a pot and stir-fry.
When browned, add kimchi, onion, and minced garlic, and stir-fry together.
Add red pepper powder and stir-fry.
Add water and tofu.
Season with doenjang (soybean paste) and soy sauce.
Bring to a boil, then add green onion to finish.