Heat a cooking pot and pour-in the beef stock. Bring to a boil.
Put-in the garlic and onions then cook until the texture becomes soft.
Add the whole peppercorns, dried bay leaves, and soy sauce.
Put-in the leftover Lechon and simmer for 30 to 35 minutes.
Add the vinegar and bring to a boil. Simmer for 10 minutes.
Add the sugar and Lechon sauce then simmer for another 5 minutes.
Dash-in some salt to taste then stir.
Turn off the heat and transfer to a serving plate.
Serve hot with rice. Share and enjoy!