Bourbon-Cranberry Shrub

Combine cranberries, sugar, and vinegar in a pot. Bring to a boil, stirring until sugar is dissolved. Remove from heat; let cool completely. Refrigerate up to 3 weeks.

For each cocktail, fill a rocks glass with ice. Stir in bourbon, seltzer, and 2 tablespoons shrub liquid. Add 1 tablespoon shrub cranberries; serve immediately.