This rye cocktail was developed by Yana Volfson, bar manager at Peels restaurant in New York City. Don't be afraid of the balsamic vinegar—it doesn't make for a vinegary-tasting drink, just a fresh, tart one.

Notes: There's no need to use fancy vinegar for your reduction; find a decent under $10 brand that you'd use in a weeknight salad dressing. To make simple syrup, combine 1 cup water with 1 cup sugar in a small saucepan and heat over medium heat, stirring constantly, until sugar is dissolved. Cool before using. Simple syrup will keep in a sealed container in the refrigerator for up to 5 days.