Fill a goblet glass to the top with crushed ice
Place 7 blackberries and 9 bar spoons of bilberries into a shaker, then muddle
Pour in 0.35 oz of lime juice, 0.5 oz of sugar syrup, 0.75 oz of blackberry liqueur and 1.5 oz of gin
Fill the shaker with ice cubes and shake
Finely strain into the goblet glass
Top up with crushed ice
Garnish with blackberries, bilberries, and a sprig of mint