Drain the blood from 3 kg of pork backbone.

Gamjatang (Pork Bone Soup)
A recipe for Mukeunji (aged kimchi) Gamjatang with a refreshing and spicy broth that tastes better than restaurant versions.
What You'll Need
Instructions
Boil the Gamjatang once to parboil it.
Discard the parboiling water and wash the pork backbone in cold water to thoroughly remove blood from the bones.
Pour 7 L of water into a large pot and add the pork backbone, aged kimchi, 1 piece of ginger, 2 tbsp of Doenjang, 4 bay leaves, and 100 ml of soju to boil.
Add 3 green onions, onion, and the anchovy broth ingredients (500 g radish, dried kelp, anchovies + shrimp + dried pollack, etc.) and boil together.
Add the potatoes with their skins on, then add more green onions and chili peppers to boil together.
Finally, season with about 3 tbsp of sun-dried salt and simmer thoroughly to finish.