In a large pot, put water and beef cube. Bring to a boil.
Add onions, peppercorns and pata.
Simmer for 1 1/2 hours. Add water as you see fit.
Add potatoes and saba. Cook for 10 minutes.
Add fish sauce and bok choy. Gently mix all ingredients.
Turn the heat off and cover the pot. Wait for 10 minutes.
Serve hot and enjoy!
Inspired by Panlasang Pinoy