Muddle 6 blackberries (save 3 for garnish) with fresh mint in the bottom of your cocktail shaker until fully smashed. Add lemon juice, moonshine, simple syrup, ginger liqueur and rose water. Fill with ice, cover and shake vigorously for 30 seconds. Fill your glass with ice and strain cocktail into glass through a fine mesh strainer. Fill glass with seltzer and garnish with a skewer of remaining blackberries and fresh mint sprig.