Begin by gathering your fresh blueberries and wash them under cool water. Pat dry with a clean towel.

In a blender, combine 1 cup of prepared blueberries with 2 tablespoons of sugar-free blueberry syrup. Blend on high for 30 seconds until smooth. Strain through a fine mesh sieve for a velvety blueberry juice.

In a mixing bowl, pour in the strained blueberry juice and add 1/2 cup of heavy cream. Gently stir with a whisk until well combined.

For each serving, fill a glass with ice cubes. Pour a third of the blueberry cream mixture over the ice and top with sparkling water.

Garnish with whole blueberries and a sprig of mint. Serve immediately to enjoy the optimal fizz.