In a large saucepan, bring beef broth to a boil over high heat. Stir in the lentils. Lower the heat and simmer, uncovered, 20 minutes. Add the smoked ham, potatoes, onion, garlic, carrots, celery, basil leaves, salt and pepper. Bring to a boil. Lower the heat and simmer, uncovered, for 20 minutes or until lentils and vegetables are tender.