1Heat oven to 500°F. Turn small end of beef under about 6 inches. Tie turned-under portion of beef with kitchen string at about 1 1/2-inch intervals. Place beef in shallow roasting pan. Brush with mustard. In small bowl, mix bread crumbs and remaining ingredients. Pat bread crumb mixture onto mustard-coated beef, pressing gently. Insert ovenproof meat thermometer so tip is in thickest part of beef.
2Bake uncovered 10 minutes. Reduce oven temperature to 350°F. Bake 30 minutes longer or until thermometer reads 135°F or150°F. Cover loosely with foil; let stand 20 minutes or until thermometer reads 145°F (medium-rare) or 160°F (medium). Remove string from beef before carving. Garnish with rosemary sprigs.