01 - Combine water and sugar in a small saucepan. Bring to a gentle boil over medium heat, stirring constantly until sugar completely dissolves, approximately 2-3 minutes.
02 - Remove saucepan from heat and add fresh mint leaves. Let steep for 10 minutes to allow mint flavor to infuse into the syrup.
03 - Strain out mint leaves using a fine mesh strainer. Allow syrup to cool completely to room temperature.
04 - In a mixing bowl, whisk together the cooled mint-infused syrup, freshly squeezed lemon juice, and grated lemon zest until fully incorporated.
05 - Pour mixture into ice cream maker and churn according to manufacturer's instructions for 20-25 minutes until mixture reaches thick, slushy consistency.
06 - Transfer churned sorbet to freezer-safe container. Cover tightly and freeze for minimum 4 hours or until firm enough to scoop.
07 - Scoop frozen sorbet into chilled bowls or dessert glasses. Garnish with fresh lemon slices and additional mint sprigs if desired.