PREHEAT oven to 350°F. Trim excess fat from meat; spread evenly with mustard.
MIX bread crumbs, parsley, chives, rosemary, 3 Tbsp. of the oil, the salt and pepper; press evenly onto meat. Place on rack in roasting pan. Mix carrots and onion; toss with remaining 1 Tbsp. oil. Add to pan with meat.
BAKE 1 hour 30 min. to 2 hours or until meat thermometer registers 160°F. Let stand 10 to 15 min. before slicing. Serve with carrots and onions.