Pour the water in a cooking pot. Bring to a boil.
Add the onion and whole peppercorn. Cover and boil for 10 minutes.
Add the pork. Stir, cover, and simmer for 45 to 60 minutes.
Put-in the beef cube, calabaza squash and potato. Cook for 7 minutes.
Add the cabbage and green onions. Continue to cook for 5 minutes.
Add the fish sauce. Stir. Cook for 1 to 3 minutes more.
Transfer to a serving bowl. Serve.
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