In a small saucepan over medium heat, combine fresh blueberries and fresh lemon juice. Stir gently as the mixture heats, allowing the blueberries to soften and release their juices. Cook for about 7 minutes or until most of the blueberries have burst open.

Remove the saucepan from heat and carefully strain the blueberry mixture through a fine-mesh strainer into a measuring cup.

In a large pitcher, whisk together the strained blueberry juice with cold water and sugar. Continue to stir until the sugar has fully dissolved.

Cover the pitcher and place it in the refrigerator to chill for at least 30 minutes.

Taste the Blueberry Lemonade before serving to ensure the sweetness meets your preference. If desired, add more sugar or water.