01 - Combine sugar and water in a small saucepan. Heat over medium heat, stirring continuously until sugar completely dissolves. Remove from heat and allow to cool to room temperature.
02 - Blend raspberries in a blender or food processor until completely smooth. For seedless sorbet, press puree through a fine-mesh sieve into a clean bowl, discarding seeds.
03 - Whisk lemon juice and cooled simple syrup into raspberry puree. Incorporate lemon zest if using, mixing thoroughly until fully combined.
04 - Transfer mixture to ice cream maker and churn according to manufacturer instructions until thick and slushy consistency forms, approximately 20-25 minutes. Alternatively, pour into shallow freezer-safe container, freeze for 1 hour, then rake with fork to break crystals. Repeat every 30 minutes for 2-3 hours until smooth.
05 - Move sorbet to airtight container and freeze for minimum 2 hours before serving to achieve proper texture.
06 - Scoop into bowls or cones. Garnish with fresh raspberries and mint leaves if desired.