Combine the Dijon mustard, salt, crushed rosemary, garlic, and balsamic vinegar in a bowl.
Place the lamb in a roasting pan, with ribs curved downward and fatty side facing up. Coat the meaty portion of the lamb with the mustard mixture. Allow it to rest for 1 hour at room temperature.
Preheat oven to 450 degrees F.
Roast the lamb for 20 minutes for rare or 25 minutes for medium-rare. Remove from the oven, cover in foil and let rest for 15 minutes, then cut into individual ribs and serve. Rack of lamb is typically served pink. It is important to use a meat thermometer to make sure that you don't over or under cook it. For rare roast to 125-130 degrees F and 135-140 degrees for medium rare.
Notes
Notes:
"Frenching" refers to removing meat from the end of the bone. Frenching gives a rack of lamb a clean elegant look. You can buy the rack of lamb frenched at the grocery store or if you want to do it yourself here is a great tutorial from Simply Recipes
Keyword Easy, easy main dish, Gluten Free, holiday, lamb, low-carb, main dish, meat, roasting