How to butterfly & stuff a whole center cut pork loin

 I might suggest you check out website on how to butterfly pork loin and then try any recipe you like for stuffing. I've included one from Paula Deene. Good Luck!

http://www.culinate.com/articles/culinate8/how_to_butterfly_a_boneless_pork_loin

            Apple Stuffed Pork Loin

            Ingredients

• 3 tablespoons olive oil
• 1 large onion, chopped
• 2 Granny Smith apples, peeled, cored and chopped
• 8 fresh sage leaves
• 2 cups thick-cut white bread cubes, crusts removed
• 1 egg, beaten
• 2 tablespoons butter
• Salt and pepper
• 1/2 to 1 cup chicken broth, plus more if needed
• 1 (3 pound) pork loin roast, butterflied

Directions

Preheat oven to 375 degrees F.

In a large skillet, heat the olive oil over medium-high heat. Add the onion, apples and sage. Saute until softened. Remove from the heat and gently stir in the bread, egg, butter and salt and pepper. Add the chicken broth gradually until everything is moistened. Let the stuffing mixture cool completely before putting it in the pork loin. Spoon the stuffing down the pork, horizontally, in a line. Roll the pork over the stuffing, jelly roll style, ending with the seam down and fat side up. Lightly score the fat, in a diamond pattern, with a sharp knife. Tightly tie the pork roast up with butcher's twine, season it with more salt and pepper, and transfer to a roasting pan. Roast the pork in a preheated oven for about 90 minutes or until an instant-read thermometer registers 160 degrees F. Remove from the oven and let rest for 15 minutes before slicing. Garnish with apples and fresh herbs.