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 completely, approximately 5 minutes.
02 - Remove saucepan from heat and allow the mixture to cool for 10 minutes.
03 - Transfer the cooled mixture to a blender or food processor. Blend until completely smooth and no fruit chunks remain.
04 - Pour the blended puree through a fine-mesh sieve into a clean bowl, pressing with a spoon to extract liquid. This removes skins and seeds for a velvety smooth texture.
05 - Transfer strained mixture to a shallow, freezer-safe dish. Place in freezer for 4 hours total, stirring vigorously with a fork every hour to break up ice crystals and ensure smooth consistency.
06 - Let the 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.