Cut the fat off the loin (a little left on is ok and will be delicious)
Coat liberally with spices or marinade. Any spice will do, salt and garlic is a great combo. Refrigerate for 30 minutes or more.
Preheat the grill. Once preheated, reduce the flame that will be directly below the loin. If using a charcoal grill, find the spot with less coals.
Grill over spot with less heat for 35-45 minutes. Flip the loin every 10 minutes.
Remove from grill when outside is somewhat charred.
Wrap loin in foil and let sit for 10 minutes.
Inside should be white and juicy. A little pink is ok, as undercooked is better than overcooked.
Slice and serve with your choice of sides. Enjoy!