Cut pork neck into bite-sized pieces.
Roughly chop the aged kimchi.
Lay the kimchi in a pot and place the pork neck on top.
Slice the onion and green onion.
Mix all the sauce ingredients together.
Pour the sauce over the ingredients in the pot.
Add water and bring to a boil.
Cover with a lid and simmer over medium heat for 40 minutes.
Reduce until the broth thickens.