01 - Combine sugar and water in a small saucepan. Heat over medium heat, stirring continuously until sugar completely dissolves. Remove from heat and allow syrup to cool to room temperature.
02 - Place raspberries, cooled syrup, lemon juice, and chopped mint leaves into a blender. Process until completely smooth and uniform in texture.
03 - Pour blended mixture through a fine-mesh sieve into a clean bowl, pressing firmly to extract maximum liquid while removing raspberry seeds.
04 - Transfer strained mixture to an ice cream maker and churn according to manufacturer instructions for approximately 20-25 minutes until thick and creamy. For alternative method, pour into shallow dish, freeze for 1 hour, then stir vigorously with fork. Repeat every 30 minutes until set, about 3-4 hours.
05 - Move churned sorbet to a freezer-safe container. Freeze for at least 2 hours until firm and scoopable.
06 - Scoop sorbet into serving bowls or cones. Garnish with additional fresh mint leaves and whole raspberries if desired.