Add water and sugar to a medium saucepan over medium heat, stirring until the sugar has dissolved. Stir in blueberries and mint leaves and bring to a boil. Reduce heat and simmer until blueberries have broken down, about 3-4 minutes.

Discard mint leaves and strain the mixture through a cheesecloth and let cool.

Add Blueberry Simple Syrup to a large pitcher, add the juice of 6 lemons, and about 5 cups of water and whisk together to combine. Add 1/2 cup of blueberries and sliced lemons.

Note: 

Some of the water can be replaced with club soda, for a bubbly lemonade. 

For a boozy version, mix in about 200ml of vodka.

Chill.

When ready to serve, give the lemonade a stir. Serve over ice and blueberries, garnished with fresh mint.

Enjoy!