Preheat your oven to 375°F.

Place your pork loin filet on a cutting board and use a sharp knife starting about ¼" from the top of the pork loin to slice it all the way across, being careful not to cut all the way through.

Continue cutting while unrolling the meat until you have a large, rectangular piece of meat and then flatten the pork loin out even more with a meat tenderizer.

Cook macaroni and cheese according to the directions on the package and spoon on top of pork loin leaving about 1" of space around all the edges.

Fold one side of the pork loin over and slowly roll it up, being careful not to roll it too tightly or you'll lose all the macaroni and cheese out of the ends. Wrap butcher's string around the pork loin or secure with toothpicks.

Place pork loin in a shallow roasting pan and roast for 30 minutes per pound or until the internal temperature of the thickest part of the pork is 150°F.

Let stand for 10 minutes before slicing.