Wash the pork thoroughly and prepare it.
Trim vegetables such as green onions, garlic, and onion.
Put the pork in a pot, add water, and bring to a boil.
Skim off any foam that forms while boiling.
Add green onions, garlic, and onion together, then simmer over medium-low heat.
Once the pork is cooked, take it out and cut it into bite-sized pieces.
Strain the broth through a sieve for a clear soup.
Serve pork and broth in a bowl and season with salt, pepper, etc.