Preheat oven to 325 degrees F. Heat a grill or grill pan over very high heat.
Once the grill is hot, place the tenderloins on the hot grill and sear over high heat, it rotating the meat every 1-2 minutes, until well browned on all sides.
Place pork tenderloins in a baking dish and cover the pan with tinfoil. Bake for about 18-25 minutes, or until you reach an internal temperature of between 145° F – 160° F, depending on how well done you like your meat.
Remove from oven and allow the meat to rest for 10 minutes before serving.