1. Combine all of the ingredients for the rub in a small bowl and stir.

To prepare the pork:

1. Gently open the pork lengthwise, removing any tendons.  It is ok if the pork cuts in half; don't worry.
2. Gently pound the pork with a mallet.
3. Rub the pork with the rub on both sides and refrigerate while preparing the stuffing.
4. Prepare all of the ingredients for the stuffing in a bowl and mix.

To Stuff the Pork:

1. Lay the prepared pork flat and place the stuffing along the pork.
2. Gently and carefully fold the pork together.
3. Using butcher's twine, wrap the pork tightly.

To Cook the Pork:

1. Heat a large cast iron frying pan.
2. Place the pork roast in the frying pan with butter and olive oil, and let each side of the pork get a nice char on it.  This should take about 10 minutes or so.
3. Preheat oven to 350 degrees F.
4. After charring the pork roast, place it in the oven for about 30 minutes.
5. An instant-read thermometer inserted in the center should read 145°F.
6. Remove the roast and let it rest for 10-12 minutes before slicing, so that the juices redistribute. If you slice into it right away, the juices will run, drying it out.