01 - Combine sugar and water in a small saucepan. Heat over medium heat, stirring continuously until sugar completely dissolves, approximately 2-3 minutes.
02 - Remove syrup from heat. Add fresh mint leaves, gently bruising with a spoon to release oils. Cover and steep for 10 minutes.
03 - Pour syrup through fine mesh strainer into mixing bowl, pressing firmly to extract maximum mint flavor. Discard used mint leaves.
04 - Whisk lemon juice, cranberry juice, and lemon zest into strained mint syrup until fully incorporated.
05 - Transfer mixture to shallow freezer-safe dish. Cover tightly and place in freezer for 1 hour.
06 - After 1 hour, scrape mixture thoroughly with fork to break initial ice crystals. Return to freezer and repeat scraping process every 30-45 minutes for 3-4 hours until texture becomes light and fluffy.
07 - Scoop sorbet into chilled bowls and garnish with fresh mint leaves.