If the pork belly you bought is half an inch thick and sliced into strips, slice the pork belly strips into 2 inch wide.
Put in a bowl and add patis, calamansi juice, black pepper powder, garlic powder and salt.
Mix all the ingredients and massage the pork belly to coat it with the ingredients. Marinate for 30 minutes.
Before frying, add flour and mix to coat each of the pork belly slices.
Heat cooking oil in a frying pan about 1 cup then fry the pork belly until golden brown.
When cooked, remove from pan and transfer to a bowl or plate lined with paper towels.
In an empty pan, heat 1 tablespoon of oil and add butter. Stir until the butter is melted.
Add sweet chili sauce and bell pepper. Stir again until sweet chili sauce is well mixed with the butter.
Add the fried pork belly and toss until coated with the sauce. Sprinkle with spring onion as garnishing then serve hot.