1Trim excess fat from beef. Spray 12-inch nonstick skillet with cooking spray; heat over medium-high heat. Cook beef in skillet 5 to 10 minutes, turning several times, until brown.
2Place beef in 4- to 5-quart Crock-Pot slow cooker. Grate peel from orange; juice orange. Top beef with onions, carrots, tomatoes, orange peel, orange juice, broth, cumin and salt.
3Cover and cook on low heat setting 9 to 10 hours or until beef is tender.