01 - Combine blueberries, sugar, lemon juice, lemon zest, and water in a small saucepan. Cook over medium heat, stirring occasionally, until the blueberries burst and the sugar dissolves completely, approximately 5 minutes.
02 - Remove the saucepan from heat and allow the mixture to cool for 10 minutes at room temperature.
03 - Transfer the cooled mixture to a blender or food processor. Blend until completely smooth, ensuring no fruit chunks remain.
04 - Pour the puree through a fine-mesh sieve into a clean bowl to remove skins and seeds, creating a silky texture. This step is optional but highly recommended for the best consistency.
05 - Pour the strained mixture into a shallow, freezer-safe dish, spreading it evenly to promote uniform freezing.
06 - Place the dish in the freezer for 4 hours total. Stir vigorously with a fork every hour to break up ice crystals, which ensures a smooth, scoopable final texture.
07 - 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 if desired.