Slice pork, onion, and green onion into bite-sized pieces.
Stir-fry pork in a pot, then add onion and green onion and stir-fry together.
Add kimchi and red chili powder, and stir-fry.
Pour in water or broth.
Season with soy sauce for soup, minced garlic, and salt.
Add tofu and boil.
Simmer over medium heat until ingredients are cooked.