Prepare the grill for indirect grilling.  If using a gas grill, light on side of burners and leave the other half unlit.  If using a charcoal grill, pile all of the coals to one side of the grill.  A drip pan under the cool side of the grill is a good idea, unless you like to clean your grill often.

Since this Stubbs sauce has a lot of black pepper, all we need is a little Kosher salt to begin.  Sprinkle both sides of the pork tenderloin with salt.

Once the grill is hot, sear the tenderloin on all sides to product a nice crust.

Move the tenderloin over to the cool side of the grill and baste all sides with the moppin' sauce.

Close the lid and grill the pork tenderloin until done (around 145 at the center of the tenderloin), basting every 15 minutes or so with the mopping sauce.