The key to success with this Apple Feta-Stuffed Pork Tenderloin recipe is to make sure you select pork tenderloin instead of a regular pork loin roast. Tenderloins are longer and narrower than loin roasts, and they normally weigh around 1 pound each. Therefore, a two-pound (or slightly larger) package will contain two individual pieces of meat. Butterfly both pieces by cutting halfway through the meat lengthwise, without cutting all the way through. Then, pound and stuff each piece as described below.
Tip: Total cooking time will vary due to a number of factors, including individual oven temperatures, the thickness of the roasts, and the starting internal temperature of the meat. Check temperature after 50 minutes and adjust final cooking time accordingly.