II
The Method
1
The night before roasting, clean the pig thoroughly and pat the entire surface and cavity completely dry with clean cloths. Hang or set the pig on a rack in a cool, ventilated space and leave uncovered overnight. By morning the skin should feel taut and papery to the touch — no trace of surface moisture remains. Combine the cumin, garlic paste, coarse salt, and sazón into a thick paste and rub it over every centimetre of the exterior skin, working it into any folds. Return the pig to the rack, skin side up, and leave uncovered until roasting.
2
Prepare the stuffing. Sweat the aliños base in a heavy pan until softened and fragrant. Add the pork belly pieces and cook until just sealed on all sides but not fully cooked through. Add the rinsed raw rice and cumin and stir to coat with the fat. Add the par-cooked yellow peas. Season with salt, applying it lightly — the pig fat released during the long roast will season the mixture further. The stuffing must be perceptibly undercooked at this stage: the rice should be raw at the centre, the pork belly still firm. A fully cooked stuffing at this point will be dry and overworked after ten or more hours inside the pig.
3
Pack the stuffing firmly into the cavity of the pig, filling it completely to avoid air pockets. Do not overfill to the point of splitting the skin at the suture line. Using the trussing needle and butcher's twine, sew the cavity closed with a tight running stitch. This is where the dish lives or dies: a poorly sealed cavity allows steam to escape into the skin, preventing crackling from forming and producing a soft, pale exterior that no amount of additional heat will rescue. Pull each stitch firm and knot the ends securely.
4
Place the pig on a rack in a large roasting vessel, skin side up. In a horno de barro, load the oven to full heat. In a domestic oven, preheat to 230 °C. Roast at this high initial temperature for 30 minutes — during this period the skin begins to dry, tighten, and take on its first colour. Do not open the oven. The smell shifts from raw pork to rendered fat and toasted cumin; a faint sizzling sound is audible.
5
Reduce the oven temperature to 160 °C. Continue roasting undisturbed for 7 to 10 hours, adjusting total time to the weight of the pig. Do not open the oven to baste — lechona is a closed-oven dish; each opening drops the temperature and extends the cooking time proportionally. The pig renders its own fat continuously through the roasting period, which bastes the stuffing from the inside. The ambient smell deepens to caramelised pork and spice.
6
In the final 30 minutes, increase the oven temperature to 220 °C. Score the skin in a crosshatch pattern if not already done. The scored squares puff individually into blistered, amber panels. The skin must be a deep amber to mahogany colour — not pale gold, not dark brown — and audibly hollow when tapped with a knuckle. A dull thud indicates the skin is still soft beneath; a sharp, resonant knock confirms the crackling shell has formed.
7
Remove the pig from the oven and rest it uncovered, at room temperature, for a minimum of 20 minutes before cutting. During resting the crackling hardens to its final shattering texture and the interior juices redistribute through the stuffing. Cutting immediately produces a soggy skin and a loose, wet interior. The crackling, when tapped after resting, should ring cleanly; a portion of lechona is served with crackling, stuffing, and roast pork belly — the three textures together constitute the complete dish.