Cantonese Crispy Pork (Siu Yuk) — Golden Crackle Technique

Ingredients

• 1.2 kg pork belly, skin-on, flat and even in thickness, scored across the skin in a fine grid with a metal skewer — more perforations yield more uniform crackle
• For the skin
• 1 tsp baking soda, made into a paste with a few drops of water; applied to scored skin only
• 2 tbsp rice vinegar, rubbed over skin after baking soda application to neutralise excess alkalinity and tighten the surface
• For the flesh
• 1 tsp five-spice powder, rubbed into flesh side only
• 2 tsp fine salt, rubbed generously into flesh side; draws moisture out during the overnight dry and seasons the meat from below

Method

1. 1
   Lay the pork belly skin-side up on a board. Pierce the skin across its entire surface in a close grid pattern using a metal skewer — work methodically, as uniform perforation is the foundation of uniform crackle. Do not drive the skewer deep enough to breach the fat layer beneath; cuts into fat cause shrinkage as moisture escapes during roasting.
2. 2
   Turn the belly flesh-side up. Rub the five-spice powder and salt thoroughly into the flesh. Turn skin-side up again. Apply the baking soda paste evenly across the scored skin, working it into the perforations. Follow immediately with the vinegar, rubbing it over the same surface: the vinegar neutralises excess alkalinity and contracts the skin. The skin should feel taut and slightly matte.
3. 3
   Place the belly skin-side up, uncovered, on a rack set over a tray. Refrigerate overnight. Before roasting, inspect the skin: it must be completely dry to the touch — any residual surface moisture will cause the skin to steam rather than crackle. Tap the skin gently; a dry, hollow sound confirms it is ready.
4. 4
   This is where the dish lives or dies. Heat the oven to 240 °C. Roast the pork belly skin-side up at this high heat for 30 minutes. The initial blast of high heat is essential to start the crackling reaction — insufficient heat at this stage produces pale, soft or tough skin that no subsequent cooking can correct. Watch for the skin to blister and begin to lift into bubbled, golden domes across its surface.
5. 5
   Reduce the oven to 190 °C and continue roasting for a further 30 to 40 minutes, until the meat is cooked through and the crackle has set to a deep, even amber across the whole surface. The skin should shatter audibly when pressed with the back of a spoon — the test of true 'glass skin'.
6. 6
   Remove from the oven and rest briefly before cutting. Use a cleaver or heavy knife to portion through the crackling in clean, decisive strokes — hesitation causes the crackle layer to shear unevenly from the fat beneath.