Cut the pork shoulder into bite-sized pieces.
Cut the kimchi into bite-sized pieces.
Add cooking oil to a pot and sear the pork on all sides.
Place the kimchi on top of the pork.
Slice the onion and green onion, then add them to the pot.
Add soy sauce, sugar, minced garlic, and gochugaru (Korean red pepper flakes) and mix well.
Pour in water or broth.
Cover and simmer over medium-low heat for about 40 minutes.
Taste the broth and adjust the seasoning with salt if necessary.