01 - In a small saucepan, combine the granulated sugar and water. Heat over medium heat, stirring continuously until the sugar is completely dissolved, approximately 2 to 3 minutes. Remove the saucepan from the heat and allow the syrup to cool completely to room temperature.
02 - In a blender or food processor, combine the raspberries, fresh lemon juice, and finely chopped mint leaves. Process until the mixture is completely smooth.
03 - Pass the blended raspberry purée through a fine-mesh sieve into a large bowl. Press firmly on the solids to extract as much liquid as possible, discarding the seeds.
04 - Gently stir the cooled simple syrup into the strained, smooth raspberry mixture until thoroughly combined and uniform.
05 - Transfer the combined mixture into an ice cream maker. Churn according to the manufacturer's instructions, typically for 20 to 25 minutes, until the sorbet achieves a soft-serve consistency.
06 - Carefully transfer the churned sorbet into an airtight, lidded container. Place in the freezer for a minimum of 4 hours, or until the sorbet is thoroughly firm and scoopable.
07 - Scoop the firm sorbet into chilled bowls or glasses. Garnish with additional fresh mint leaves, if desired, before serving immediately.