Korean
Heat the oil in a pot over medium heat and stir-fry the pork for 3 minutes.
Add the kimchi, onion, garlic, chili flakes and sugar and stir-fry for 5 minutes, until the kimchi softens.
Pour in the water and kimchi juice, bring to a boil, then cover and simmer for 15 minutes.
Cut the tofu into 1.5 cm slices, add it to the pot and simmer uncovered for 5 minutes.
Taste the broth and add salt only if needed.
Add the green onions, cut into 4 cm pieces, and cook for 1 minute.
Serve bubbling hot with rice.