Fill a chilled rocks glass with crushed ice. Add all ingredients. Garnish with blackberries.
The blackberry is one of the more majestic-looking fruits around, and this -- combined with a flourishing cultivation of this bramble -- has currently made it boom in bars all over the globe. Trivia: Superstitious Brits thought that the Devil peed on blackberries on September 29, thus didn't pick them after that date. Muddled, the blackberry is deeply red.