01 - Combine blueberries, sugar, lemon juice, lemon zest, and water in a small saucepan. Cook over medium heat, stirring occasionally, until blueberries burst and sugar dissolves, approximately 5 minutes.
02 - Remove saucepan from heat and allow the mixture to cool for 10 minutes.
03 - Transfer cooled mixture to a blender or food processor. Blend until completely smooth and uniform in texture.
04 - Pour blended puree through a fine-mesh sieve into a clean bowl, pressing with a spatula to extract liquid while removing skins and seeds. This step ensures a smoother final texture.
05 - Transfer strained mixture to a shallow, freezer-safe container, spreading evenly to facilitate rapid freezing.
06 - Place container in freezer for 4 hours total. Every hour, remove and stir vigorously with a fork to break up ice crystals, ensuring a smooth, creamy consistency.
07 - Let sorbet sit at room temperature for 5 to 10 minutes before serving to soften slightly. Scoop into bowls and garnish with fresh mint or blueberry sauce if desired.