To make the blueberry syrup, add water, sugar, fresh blueberries, and lemon zest to a small saucepan and bring to a boil on medium heat. Stir consistently and lightly smash the blueberries. Simmer for a few minutes, take off heat and then let rest for 20 more minutes. Strain through a mesh strainer into a container. Let cool completely before using.

Add blueberry syrup and lemonade to a glass.

Top with Champagne or Prosecco and garnish with blueberries and lemon slices.

Enjoy!