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 mixture to cool for 10 minutes to room temperature.
03 - Transfer cooled mixture to blender or food processor. Blend until completely smooth, with no visible fruit pieces remaining.
04 - Pour blended puree through fine-mesh sieve into clean bowl, pressing with spoon to extract liquid. Discard skins and seeds for ultra-smooth texture.
05 - Pour strained mixture into shallow freezer-safe container. Freeze for 4 hours total, stirring vigorously with fork every hour to break ice crystals and ensure smooth consistency.
06 - Let sorbet sit at room temperature 5-10 minutes before scooping to soften slightly. Serve immediately.