In a casserole, put the pork belly, pour water and add 1 teaspoon salt.
Bring to boil and simmer for 30 minutes or until meat is tender.
Remove the water and let the pork cool down. Now, mince the pork belly. Set aside.
Put slices on the pig's skin and fry it in a pan until golden brown.
After frying, transfer onto a chopping board and cut it into small cubes.
Put 1 tablespoon oil in a frying pan then sauté the garlic, onion, and ginger.
Put the minced pork belly and cook over medium heat.
Put the calamansi, crushed pepper, ½ teaspoon salt, green chillies, chili, pig's brain then mix it
After mixing, put the mayonnaise and egg. Continue mixing until egg is cooked.
Serve while hot.