Pork tenderloin is such a great meat to cook for meals. Not only is the flavor awesome, it's tender (hence the name...) but it is also really quick to grill. It can easily be ready, start to finish in 30 minutes. I glazed mine at the last minute with some homemade honey mustard (¼ cup regular mustard with 1 tablespoon honey).
If you have time, pull your tenderloin out of the fridge and bring it to room temp. If not, it's still ok. I like to always grill or skillet fry meats at room temp. Preheat your grill pretty hot, mine was about 500 degrees.
The seasoning mix I always use for my steaks and roasts is this- 1 tablespoon salt, 1 teaspoon ground black pepper, 1 teaspoon garlic salt, ½ teaspoon paprika and ¼ teaspoon ground cayenne pepper. sprinkle mix on you tenderloin and rub in.
Grill it for about 5-8 minutes per side. If you are using the honey mustard like I did, or a BBQ sauce, add that on the last 5 minutes or so. Let the meat rest, covered in saran wrap for about 5-8 minutes. Slice and ENJOY!!