Place the rib piece, bone down, straight into a large pan.
Cut the matambre (the blanket that comes over the meat) in the shape of a diamond, lightly with the knife and spread the salt and black pepper throughout the piece.
Drizzle with oil. It will help make our ribs more succulent as it helps in breaking down collagen, leaving the meat very tender.
Close the mold, tightly closed with aluminum foil to prevent steam from escaping. Do several turns if necessary.
Bake for 5 hours, test with a fork to see if it's soft. Remove from foil and return to oven at 250 degrees to brown for 30 min. to finish golden.