Cut pork, onion, tofu, and green onion into bite-sized pieces.
Add the pork to a pot and stir-fry over medium heat.
Add kimchi and onion, stir-fry them together, then pour in water.
Add tofu, cover the pot, and bring to a boil.
Season with soy sauce for soup and minced garlic.
Add green onion and simmer for another 2-3 minutes.