01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or foil.
02 - Pat the rack of lamb dry with paper towels. Trim excess fat if necessary.
03 - Rub the lamb all over with olive oil, then season generously with salt and pepper.
04 - In a small bowl, mix rosemary, thyme, and garlic. Press the herb mixture firmly onto the meaty side of the lamb.
05 - Brush the lamb with Dijon mustard before applying the herb crust for extra flavor.
06 - Place the rack, fat side up, on the prepared baking sheet.
07 - Roast in the preheated oven for 20–25 minutes for medium-rare (internal temperature of 130°F). Adjust time for desired doneness.
08 - Remove from the oven, tent loosely with foil, and let rest for 10 minutes.
09 - Slice between the ribs to serve. Garnish with parsley and a sprinkle of flaky sea salt.