Fresh Tomato Soup

In a large saucepan, cook onion in butter until tender. Stir in flour to form a smooth paste. Gradually add water, stirring constantly until thickened. Add the tomatoes, parsley, salt, sugar, thyme, bay leaf and pepper; bring to a boil. , Reduce heat; cover and simmer for 20-30 minutes or until tomatoes are tender. Discard bay leaf.