Ladd's Grilled Tenderloin

IMPORTANT: Be careful with the melted butter, as it gets very hot on the grill. Use long, heavy tongs and wear heavy gloves when transporting the pan of finished tenderloin. Using a sharp knife, carefully trim the silvery, tough membrane off the top of the tenderloin, leaving all the sections of the tenderloin intact. Place it into a heavy duty foil roasting pan and pour on the melted butter. Sprinkle on some of the seasonings, then place the pan on the grill. After the butter starts to get hot, let it cook for a good 10 minutes, then turn it over and season the other side. Turn the tenderloin every 7-8 minutes, or as it starts to brown. If butter cooks away, add more! Cook the tenderloin, turning occasionally, for a total of 20 to 30 minutes, depending on how thick it is. If using a meat thermometer, remove it when the temperature reaches 125 to 130 degrees. Transfer the tenderloin to a large baking sheet or cutting board and let it rest for 5 to 10 minutes before slicing. Slice as thin or thick as you'd like!