INGREDIENTS:

• 1.5 kg pork belly slab, skin on
• 3 whole garlic bulbs, peeled and roughly chopped
• ½ cup oregano leaves, washed then chopped
• 3 red onions, peeled and chopped around 4 – 5 lemongrass stalks, sliced the zest from 1 lemon
• juice from 1 lemon
• a little over 1/8 cup salt, plus more for an even rub around the pork
• 4 tablespoons crushed black pepper

HOW TO COOK:

1. Combine all the aromatics in a bowl and mix well.
2. Lightly mash everything together with the back of a spoon.
3. Roll the slab, carefully invert the meat and secure it with butcher’s twine.
4. Rub coarse salt all over the meat, including the skin.
5. With a paring knife or fork, poke the skin of the meat. This will ensure a nice crackling.
6. Transfer it to a roasting fitted with a rack and the bottom lined with foil.
7. Place it in the refrigerator to chill overnight. This will dry the skin, which helps the crackling form. 
8. Preheat the oven to 160 C. Just to be sure, pat the skin of the pork dry with a paper towel. Roast the pork for 5 hours.
9. Afterwards, increase the temperature to 220 C, and allow the pork’s crackling to form. This will take another 30 minutes to an hour.
10. When done, remove from the oven and allow to cool a bit before slicing. Enjoy!

Source: http://www.mykusinamasterrecipes.com/roasted-lechon-pork-belly-recipe/