01 - Set the oven to 425°F and line a roasting pan with foil or parchment paper.
02 - Pat the lamb racks dry with paper towels and trim any excess fat.
03 - In a small bowl, thoroughly mix rosemary, thyme, parsley, garlic, Dijon mustard, salt, pepper, and olive oil until blended.
04 - Rub the herb mixture evenly over all surfaces of the lamb racks.
05 - Position the racks bone-side down in the prepared pan and let rest for 15 minutes.
06 - Roast for 20 to 25 minutes, aiming for a medium-rare internal temperature of 130 to 135°F.
07 - Remove from oven, loosely cover with foil, and allow to rest for 10 minutes.
08 - Slice between bones into individual chops and serve with lemon wedges and flaky sea salt if desired.