In a large skillet cook beef, onion, sweet pepper, and carrot until meat is brown; drain fat. Stir in KELLOGG'S ALL-BRAN Original cereal, tomato sauce, undrained diced tomatoes, Worcestershire sauce, cumin, and salt. Bring to boiling. Reduce heat and simmer, uncovered, 5 minutes, or until desired consistency, stirring occasionally. Serve in buns. Serve with carrot sticks (if desired).