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 - Puree raspberries in a blender or food processor until completely smooth. For seed-free texture, strain puree through a fine-mesh sieve into a clean bowl, discarding the seeds.
03 - Pour lemon juice and cooled simple syrup into the raspberry puree. Add lemon zest if using, and stir thoroughly until fully incorporated.
04 - Transfer mixture to ice cream maker and churn according to manufacturer's instructions until thickened to slushy consistency, approximately 20-25 minutes. Alternative method: Pour into shallow freezer-safe container, freeze for 1 hour, then rake with fork to break ice crystals. Repeat every 30 minutes for 2-3 hours until smooth and scoopable.
05 - Move sorbet to an airtight container and freeze for minimum 2 hours to achieve proper serving consistency.
06 - Scoop into chilled bowls or cones. Garnish with fresh raspberries and mint leaves if desired.