Here's my mother's recipe from way back.
Roast Stuffed Pork Tenderloin
3 large tenderloins
1/2 tsp salt
1 c bread crumbs
pinch of pepper
1/2 c chopped apple
1/8 tsp. paprika
3 tbsp. melted shortning
1/4 tsp. sage
hot water to moisten
Split meat lengthwise. Fill with stuffing & tie with cord...