In a pot heat up your sesame oil and sauté kimchi for a few minutes until soft.
Add pork to the pot and cook for a few minutes.
Add your onions, green onions, garlic and mushrooms. Cover the ingredients with water until the ingredients are just covered. Add your gochujang and gochugaru.
Bring the ingredients to a boil. Give the soup a stir and add fish sauce.
Bring the heat down to medium and cook for another 10 minutes. Add your tofu and cook for a few more minutes.
Serve with a hot bowl of rice.