A meat thermometer will ensure that the center of the lamb is just the right shade of pink. We recommend serving with Roasted Beets, Carrots, and Sweet Onions.
Process first 5 ingredients in a food processor 2 to 3 minutes or until blended. Rub mixture over lamb, and place on a rack in a roasting pan. Chill 12 to 24 hours.
Let lamb stand at room temperature 30 minutes. Meanwhile, preheat oven to 450°. Brush lamb with olive oil.
Bake at 450° for 45 minutes; reduce oven temperature to 350°, and bake 1 more hour or until a meat thermometer inserted into thickest portion registers 145°. Let lamb stand 20 minutes before serving.