01 - Combine sugar and water in a small saucepan. Heat over medium heat, stirring constantly until sugar dissolves completely. Remove from heat and allow syrup to cool to room temperature.
02 - Place raspberries, cooled syrup, lemon juice, and chopped mint leaves in a blender. Process on high speed until completely smooth and no fruit chunks remain.
03 - Pour blended mixture through a fine-mesh sieve into a clean bowl. Press firmly with a spoon to extract maximum liquid while removing raspberry seeds.
04 - Transfer strained mixture to an ice cream maker and churn according to manufacturer's instructions for approximately 20-25 minutes until mixture reaches thick, creamy consistency. Alternative method: Pour into shallow dish, freeze 1 hour, then stir vigorously with fork. Repeat every 30 minutes until set (3-4 hours total).
05 - Scoop churned sorbet into freezer-safe container. Cover tightly and freeze for minimum 2 hours until firm enough to scoop.
06 - Using a warmed ice cream scoop, portion sorbet into serving bowls or cones. Garnish with additional fresh mint leaves and whole raspberries if desired. Serve immediately.