Score the fat cap diagonally leaving about ½ inch between cuts. Then turn the loin and score again creating a diamond pattern.
Now to butterfly your pork loin. Begin incision on the top third of the loin stop about a ½ inch from end. Open up your loin then cut the top ½ down to ½ inch from the end. Then open up and flatten your loin.
Baste the opened-up pork loin with chimichurri sauce
layer your cheese in keeping it toward the center so it does not flow out when melted.
Tightly roll up your loin and tie with butcher twine
Cook at 350 degrees until the internal temperature is between 140-145 degrees. Ours took about 45 minutes. Cooking time will vary I recommend checking the internal temperature after 35 minutes to gauge cooking time.