Combine pork, pineapple juice, and soy sauce in a bowl. Mix well. Cover the bowl and marinate the pork for at least 1 hour.
Start to boil the eggs by placing in a cooking pot with water. Turn on the heat and bring to a rapid boil. Turn the heat off when the water starts to boil rapidly. Let the egg stay submerged in hot water for 10 minutes. Discard the hot water and pour-in cold water right away to stop the eggs from cooking through residual heat. Add ice cubes and let it stay for 10 minutes. Peel and set aside.
Cook the pork adobo by heating oil in a cooking pot. Add crushed garlic. Cook until light brown.
Separate the marinade from the pork belly. Set it aside. Put pork in the pan. Cook until light to medium brown.
Pour marinade into the pan. Add water. Let the mixture boil.
Add Knorr Pork Cube, whole peppercorn, and dried bay leaves. Cover and cook between low to medium heat for 1 hour or until the pork is tender.
Pour vinegar and add brown sugar into the pan. Stir. Turn the heat off. You can add the peeled eggs or serve it separately with the pork adobo.
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Marinating the meat longer will produce the best result.