You make balsamic reduction by heating balsamic vinegar. You stir this. You can add sugar or other things. It thickens and makes a glaze.
But if you turn your back for a minute and don't realize you're actually up on med-high, you might over-reduce it and get balsamic taffy.
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Heat on very low and slowly add in some water while stirring to bring it back to a sauce consistency.
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