Sauté the pork belly or tofu in a pot with some oil until browned.
Add the onion, garlic, and ginger and cook until fragrant.
Add the kimchi, gochujang, soy sauce, and sesame oil. Stir to combine.
Pour in enough water to cover the ingredients and bring to a boil.
Reduce heat and simmer for 15-20 minutes, until the flavors have melded.
Garnish with green onions before serving.
