Prep time 1 minute
Cook time 5 minutes
Yield: Serves or Makes 1
In a shaker, muddle the gin and the blackberries. Add all the other ingredients except for the soda water. Fill the shaker with ice and shake vigourously for 10 seconds
Using a fine mesh strainer, pour the liquid into a highball glass filled with fresh ice. Top with the soda water and garnish with a rosemary sprig and 3 blackberries.
Put two sprigs of rosemary in 2 cups of hot water and granulated sugar. Stir until the sugar is entirely dissolved and let cool down to room temperature.