01 - Preheat the oven to 425°F. Line a roasting pan with foil or parchment paper.
02 - Pat the lamb racks dry with paper towels and trim any excess fat as needed.
03 - In a small mixing bowl, combine rosemary, thyme, parsley, garlic, Dijon mustard, sea salt, black pepper, and olive oil until well blended.
04 - Rub the herb mixture evenly over all sides of the lamb racks.
05 - Place the lamb racks bone-side down in the prepared roasting pan and let rest at room temperature for 15 minutes.
06 - Roast in the preheated oven for 20 to 25 minutes until the internal temperature reaches 130–135°F for medium-rare doneness.
07 - Remove the racks from the oven, loosely cover with foil, and allow to rest for 10 minutes.
08 - Slice between the bones into individual chops. Serve with lemon wedges and a sprinkle of flaky sea salt if desired.