Place beans in a saucepan and cover with water; cook for 8-10 minutes or until crisp-tender. Meanwhile, in a skillet, saute onion and green pepper in butter until tender. Stir in tomatoes, sugar, salt, bay leaf and cloves; simmer for 10 minutes. Drain beans; add to tomato mixture. Cover and cook for 5 minutes or until heated through. Discard bay leaf and cloves.