In a small bowl, combine the first seven ingredients. With a sharp knife, cut 1/2-in.-deep slits in fat side of roast. Rub spice mixture into slits and over roast. Place roast fat side up in a shallow roasting pan. Place onion and carrots around roast.
Bake, uncovered, at 350° for 1 hour 40 minutes or until tender. Let stand for 15 minutes before carving. Yield: 12 servings.