Use these cherries in a Manhattan or spoon them with their syrup over ice cream for an adult dessert.
Bring bourbon and sugar to a gentle simmer in a small saucepan over low heat. (Watch carefully, since bourbon may ignite.) Simmer, stirring, until sugar dissolves.
Pour bourbon syrup over cherries in a 12-ounce glass jar. Let stand overnight to macerate.
Cherries can be refrigerated in syrup for up to 2 months.