2 oz. bourbon
½ oz. lime juice
6-7 mint leaves
2-3 blackberries, plus more for garnish
¾ oz. simple syrup
1 oz. club soda or ginger beer

Muddle mint leaves and blackberries in a martini shaker.  Fill the shaker with ice and add bourbon, lime juice, and simple syrup.  Shake well and strain into an old fashioned glass filled with ice. (A large ice cube would be best.)  Top with club soda or ginger beer and garnish with a skewer of blackberries and a lime wedge.