Stuffed Pork Roast

Ingredients 1/2 pound bulk pork sausage 2 cups herb-seasoned stuffing mix 1 cup peeled, chopped, tart apple 3/4 cup hot water 1/2 cup dried celery 1/2 cup raisins 1 tablespoon diced onion 1/2 teaspoon salt 1/2 teaspoon sage 1/8 teaspoon pepper 1 (4- to 6-pound) boneless, rolled pork loin roast 1/2 teaspoon salt, divided 1/2