"When you use a shrub as the foundation for this drink," says Mary Karlin, author of Mastering Fermentation, "you've got the sweet and the tart covered. It doesn't take much more to create a cocktail."
In a cocktail shaker, shake shrub, vodka, and grenadine with ice. Strain into a chilled rocks glass, top with tonic water, and garnish with the mint sprig.
