How to Make It
Fold the thin end of the tenderloin roast under to make the meat an even thickness. Tie the roast at 1-inch intervals and transfer to a large rimmed baking sheet. In a small bowl, combine the olive oil with the garlic, pepper, thyme, marjoram, rosemary and salt. Rub the herb oil all over the roast and refrigerate for 2 to 4 hours. Bring to room temperature before grilling.
Light a grill. Grill the roast directly over moderately high heat, turning often, until nicely charred, about 30 minutes for medium-rare. Transfer to a carving board and let rest for 10 minutes. Slice the roast 1/2 inch thick and serve.