2 oz Gin — none
1 oz Elderflower liqueur — none
0.5 cup Fresh blueberries — muddled
10 leaves Fresh mint leaves — muddled
2 oz Soda Water — none (optional)
1 cup Ice — for shaking
1 sprig Mint Sprig — for garnish (garnish)
3 pieces Blueberries — for garnish (garnish)