Check Labels

The best balsamic vinegar will have nothing added to it except grapes. A company which produces a true “traditional” balsamic vinegar will usually also produce a less expensive version, but it is still considered a quality balsamic vinegar that was made following the exact principles, the only difference is that it hasn't been aged as long. You can have confidence when buying these. But, make sure you check the labels for the “LESSER” quality balsamic vinegars...they will contain brown sugar or caramel to mimic the sweetness of the better vinegars.