Have a grill running medium hot. I am using my Big Green Egg, but any grill will be fine. Oil grates, then place tenderloin on grill. Cook for 10 minutes or until bottom is reaching 130 degrees. Carefully flip and cook for another 8-10 minutes or until top meat is approaching 140. Depending on tenderloin, you may need to place “sides” on grill for a minute or two to ensure doneness. Remember, I am doing this on an egg, which also has a “baking” effect, so if using a gas grill you may want to adjust your times.