This recipe has the ability to make pork tenderloin something I actually enjoy eating. There are probably a ton of things you can stuff into a log of pork, but spinach and feta is the only one I've tried and it's excellent.
Spinach and Feta Stuffed Pork Tenderloin
1 tablespoon olive oil
1/2 cup minced yellow onion
2 packages frozen spinach, thawed and squeezed dry
Two 1-pound pork tenderloins
5 ounces feta cheese, crumbled
1 cup dry white wine
1 cup low-salt chicken broth
Salt (preferably kosher or sea salt) and freshly ground pepper
1. Preheat the oven to 350°F.
2. Heat 1 tablespoon of the olive oil in a large skillet over medium-high heat. Add the onions and sauté until they begin to soften, about 5 minutes. Add the spinach and sauté for a couple of minutes until the moisture evaporates. Remove from heat and let cool.
3. Cut through each pork tenderloin lengthwise to within ½-inch of cutting all the way through. Open up the pork like a book and pound out each side until it’s about ¼-inch thick. Distribute the spinach over each tenderloin and top with the cheese. Roll each tenderloin jelly-roll style from the long side, and tie with string in 5 places. Season the outside of each tenderloin with salt and pepper. Let stand 30 minutes.
4. Roast the pork until a thermometer inserted into thickest part registers 150°F, about 35 minutes. Transfer the tenderloins to a platter; cover loosely with foil. Place the same skillet over medium heat, and add the wine and broth. Boil until the sauce thickens, scraping up browned bits, about 10 minutes. Season with salt and pepper. To serve, remove strings from the pork and cut into 1/2-inch-thick slices. Spoon the sauce over the pork.