In a cocktail shaker, combine the fresh blueberries and thyme sprigs. Use a muddler to crush them together until the blueberries are well smashed and the thyme is aromatic. This releases their flavors.

Pour the vodka, lemon juice, and simple syrup into the shaker.

Add a handful of ice to the shaker. Secure the lid and shake vigorously for about 15-20 seconds. This chilling and dilution is key for the perfect smash.

Strain the mixture into an ice-filled glass. You can double strain it if you prefer to keep out the small bits of blueberry and thyme.

If desired, top up the drink with a splash of soda water for a lighter version. Garnish with a few fresh blueberries, a sprig of thyme, and a lemon wheel on the rim of the glass.

Serve immediately and enjoy the burst of refreshing flavors.