Prep the pork belly: Pat the pork belly dry very well. Use a sharp knife to score the skin in a crosshatch pattern or poke many small holes through the skin only.
Don’t cut into the meat. Dry skin equals crisp skin.
Season the meat side: Flip the slab skin-side down. Rub with salt, pepper, five-spice, and rice vinegar.
Let sit 15 minutes while you mix the glaze.
Make the glaze: In a bowl, whisk soy sauce, dark soy (if using), honey, hoisin, vinegar, sesame oil, garlic, ginger, and sriracha. Reserve 1/3 cup for brushing later. Use the rest to coat the meat side only.
Keep the skin dry and free from glaze.
Dry the skin: Blot the skin again. Rub a thin film of neutral oil onto the skin, then sprinkle a little extra salt. This helps draw out moisture and promotes blistering.
Preheat the air fryer: Heat to 375°F (190°C) for 3–5 minutes.
Place the pork belly in the basket, skin-side up, on a small piece of foil or a perforated parchment liner to catch drips. Make sure hot air can circulate.
First cook: Air fry at 375°F (190°C) for 30 minutes. Check halfway and dab any pooled moisture on the skin with a paper towel.
Avoid brushing the skin with glaze at this stage.
Crisp the skin: Increase to 400°F (205°C) and cook 10–15 more minutes, until the skin is golden, bubbly, and crisp. If certain spots lag, rotate the basket or cook 5 more minutes. The internal temp should hit at least 165°F (74°C), though pork belly is forgiving if you go higher.
Glaze finish: Carefully remove the pork and brush the meat sides with the reserved glaze.
Air fry 2–3 minutes more at 375°F to set the glaze without soaking the skin. Do not glaze the skin.
Rest and slice: Let the pork rest 10 minutes. Slice into thick or thin pieces with a sharp knife.
Garnish with scallions and sesame seeds. Serve over rice, tucked into bao, or alongside crunchy pickles.