Ingredients

• 1 1/2 tablespoons kosher salt
• 2 tablespoons minced fresh rosemary leaves
• 3 garlic cloves, minced
• 1/2 cup Dijon mustard
• 1 tablespoon balsamic vinegar
• 2 racks of lamb, "frenched" (see note)

Instructions

1. Watch how to make this recipe.
2. In the bowl of a food processor fitted with a steel blade, process the salt, rosemary, and garlic until they're as finely minced as possible. Add the mustard and balsamic vinegar and process for 1 minute. Place the lamb in a roasting or sheet pan with the ribs curving down, and coat the tops with the mustard mixture. Allow to stand for 1 hour at room temperature.
3. Preheat the oven to 450 degrees F.
4. Roast the lamb for exactly 20 minutes for rare or 25 minutes for medium-rare. Remove from the oven and cover with aluminum foil. Allow to sit for 15 minutes, then cut into individual ribs and serve.