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1
Ensure the trimmed loin is at 4°C (39°F) or below before proceeding — a warm surface during the marinade window allows Gram-negative surface bacteria to activate before the Pimentón phenols establish their inhibitory layer. Combine the 25 g Pimentón de la Vera DOP agridulce, 15 g coarse Sal Marina Gruesa, 5 g Origanum vulgare, 5 g Allium sativum purée, 5 g Thymus vulgaris, 2 g cracked Piper nigrum, and 60 ml dry Oloroso fino to form the adobo. Coat the loin entirely on all faces. Refrigerate at 4°C (39°F) for 48 hours. The loin is ready when the outer surface is deeply coloured and the adobo has visibly penetrated the outer 3–5 mm of lean.
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2
Remove the loin from the adobo and pat the surface dry with a clean cloth. Weigh the loin. Calculate 3.0% of that weight in coarse Sal Marina Gruesa de Cádiz. Press the coarse crystals firmly against all faces of the loin. Vacuum-seal immediately and cure at 4°C (39°F) for 7 days, turning the bag daily to redistribute brine. Do not allow the cure temperature to exceed 4°C (39°F) — rancidity initiates in the thin external fat layer before salt penetrates to the loin centre at higher temperatures. The cure is complete when the lean has firmed uniformly and no soft, yielding zone is detectable at the loin centre under finger pressure.
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3
Remove the loin from the vacuum bag. Rinse under cold running water for 5 minutes to remove surface salt. Pat completely dry with a clean cloth. Stuff the loin into the natural Sus scrofa domesticus tripa casing without piercing the casing at any point — a single perforation from a knife or skewer creates a local air-dry acceleration that produces a hard, dry band at the puncture site. Tie both ends and at 8 cm intervals with butcher's cord. The stuffed loin should feel evenly packed, with no air pockets visible under the casing.
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4
This is where the lomo lives or dies: hang the cased loin in a chamber held at 10–14°C (50–57°F) and 70–75% relative humidity for a minimum of 2 months, up to 4 months for bellota-grade product. Temperature must not exceed 15°C (59°F) — above this threshold, surface case-hardening seals moisture inside and produces a soft, under-cured core visible as a pale, translucent zone when the loin is sliced. Humidity above 80% produces a slick or wet casing surface and prevents the Penicillium nalgiovense bloom from establishing. The loin is ready when the casing shows a uniform white Penicillium nalgiovense surface bloom and the loin resists a fingernail throughout — no soft zone detectable at any point along its length.
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5
Two to three days before the surface feels completely rigid, the lomo is at the correct cutting stage — the interior continues to firm after first cutting. Slice at 1.5–2 mm on a manual cured-meat slicer set cold at 6°C (43°F); the oleic acid-rich intramuscular fat smears at room temperature under a warm blade. Plate the slices and allow to rest at 20°C (68°F) for 8 minutes before service. The aroma is ready when smoked Capsicum annuum sweetness opens clearly from the cut surface, with a background of dried herb and clean cured pork-loin character, and no rancid or acrid notes.