Coat a grill pan (or grill) with cooking spray and heat over medium-high heat. Sprinkle the black pepper and salt evenly over the pork. Grill, uncovered, for 28-30 minutes or until internal temperature reaches 145 degrees F., turning every 3-4 minutes.
Meanwhile, combine the relish ingredients.
Transfer pork tenderloin to cutting board. Loosely cover with foil; let rest for 5 minutes before thinly slicing. Serve with relish.
Makes 12 ounces cooked pork and 1 1/3 cups relish total.
Serves 4
3 ounces cooked pork and 1/3 cup relish per serving