01 - Preheat oven to 400°F.
02 - Pat the rack of lamb dry with paper towels.
03 - In a small bowl, mix olive oil, garlic, rosemary, thyme, parsley, Dijon mustard, salt, and pepper to form a paste.
04 - Rub the herb-garlic mixture all over the lamb, coating evenly.
05 - Let the lamb marinate at room temperature for 15–20 minutes (or cover and refrigerate up to 4 hours; bring to room temperature before roasting).
06 - Place the lamb, fat side up, on a rack in a roasting pan or oven-safe skillet.
07 - Roast in the preheated oven for 20–25 minutes for medium-rare (internal temperature 130°F), or adjust to desired doneness.
08 - Remove from oven, tent loosely with foil, and let rest for 10 minutes.
09 - Slice between the ribs to serve. Sprinkle with flaky sea salt and garnish with fresh herbs, if desired.