Add mint to a rocks glass with crushed ice, and muddle the mint to the ice. Add the rye and shrub and stir to combine, then garnish with more mint.

Simple syrup may be substituted for the shrub.

Note from the mixologist: "Whereas a syrup (a.k.a. simple syrup) is a mixture of sugar and water with optional fruit and herbs, and bitters are concentrated tinctures of alcohol and herbs, fruit, and other flavorings, a shrub uses a base of vinegar to achieve acidity, and is then a mixture of herb and fruit flavors.  A shrub allows the cocktail to skip the ubiquitous citrus used to provide acidity, and gives a whole new range of flavors." Shrubs are easy to make, and are also available commercially by Element [Shrub] and MOTHER shrub. You can also experiment with kombucha.

Courtesy of Catoctin Creek Distilling Company, Purcellville