Transfer the tenderloin and seasoning mixture to a food-grade plastic bag.
Seal the bag with your hand and shake gently, turning it so the seasoning coats the tenderloin evenly.
Vacuum-seal the bag and refrigerate for 3 days, turning it occasionally. If you don't have a vacuum sealer, press out as much air as possible before sealing.
After 3 days, rinse the tenderloin under cold running water.
Pat the meat completely dry with paper towels.
Tie the tenderloin snugly with kitchen twine.
Roll the loin in sweet paprika and cracked black pepper until thoroughly coated.
Hang the loin in a cool, well-ventilated spot for about 3 weeks.
A fine, dry, non-sticky white bloom should develop—a sure sign your drying conditions are perfect.
Notes
For a milder cure, use only 25–30 g of salt per kilo of meat.
Ensure the drying area is well ventilated to prevent humidity.
A white bloom signals healthy fermentation and won't affect the lomo's flavor.