mix together the baking soda and salt and rub it on the pork skin
let it sit uncovered in the refrigerator for a couple hours
rinse off the salt and baking soda and cut the pork belly into small pieces about ⅓ leaving the skin attached to the belly.
Put the pork belly in a skillet or wok and cover with water. Let the pork belly braise for a hour or two until the water evaporates and you only have fat left in the pan, Make sure to do this slowly over a low heat.
Once the pork fat has rendered, turn up the heat to high and fry until crispy and golden.
Drain excess fat on a paper towel and salt to taste