For the shrub, in a large bowl, mix the peaches and brown sugar. Cover and refrigerate overnight.
Add the vinegar and stir to combine. Cover and refrigerate at least 2 days.
Strain the shrub mixture through a fine mesh sieve and store in clean glass jars. The shrub should keep refrigerated 2 to 3 weeks.
For the Bourbon Peach Tea, in a cocktail shaker with ice, combine bourbon, peach shrub, iced tea, lemon juice and mint. Shake well and strain into a glass filled with ice. Garnish with peach slices and additional mint leaves.
Recipe by Allons-Eat! at https://www.allonseat.com/peach-shrub-and-bourbon-peach-tea/