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