Place the pulp of a watermelon wedge, 2 blackberries into a shaker and muddle
Pour in 0.35 oz of lime juice, 0.5 oz of passionfruit syrup and 1.5 oz of blackcurrant vodka
Fill the shaker with ice cubes and shake
Finely strain into a chilled flute glass
Garnish with a ball of watermelon on a cocktail skewer