Step 1.
- Chill the martini glass in the freezer or fill it with ice water to cool.
Step 2.
- In a cocktail shaker, combine the sake, dry vermouth, and blueberry syrup.
Step 3.
- Fill the shaker with ice and shake vigorously for about 15 seconds.
Step 4.
- Strain the mixture into the chilled martini glass.
Step 5.
- Garnish with fresh blueberries and a sprig of mint.