Make the blueberry syrup

• Combine the blueberries, sugar and water in a saucepan.
• Simmer until the blueberries burst and the sugar dissolves, about 10 min.
• Strain through a sieve and let cool completely.

Prepare the glasses

• Rub the rim of the martini glasses with a lemon wedge.
• Dip the rims in sugar and set the glasses aside.

Shake the cocktail

• Fill the shaker with ice.
• Add the vodka, triple sec, lemon juice and blueberry syrup.
• Shake hard until well chilled, about 15 seconds.

Strain and serve

• Double strain the cocktail into the prepared glasses.
• Garnish with a lemon twist and a few blueberries.