Combine Balsamic Vinegar, simple syrup, and mint leaves in a glass and muddle gently. (Over-muddling will result in a bitter cocktail.) Add whiskey and ice, and fill with soda water. Stir and serve, garnishing with more mint leaves if desired.
*Making simple syrup is, well, simple: Combine equal parts water and sugar and simmer or microwave until sugar is dissolved, stirring periodically. Cool before using, and store in the fridge.
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