01 - Combine sugar and water in a small saucepan. Heat over medium heat, stirring constantly until sugar completely dissolves, approximately 2–3 minutes.
02 - Remove saucepan from heat. Add fresh mint leaves to the hot syrup, gently bruising them with the back of a spoon to release oils. Cover and steep for 10 minutes.
03 - Pour the infused syrup through a fine mesh strainer into a clean mixing bowl, pressing firmly on mint leaves to extract maximum flavor. Discard spent mint leaves.
04 - Whisk in freshly squeezed lemon juice, cranberry juice, and lemon zest into the strained mint syrup. Stir thoroughly until completely incorporated.
05 - Transfer mixture to a shallow freezer-safe container. Cover tightly and place in freezer for exactly 1 hour.
06 - Remove from freezer and scrape entire surface with a fork to break up forming ice crystals. Return to freezer and repeat scraping process every 30–45 minutes for 3–4 hours until mixture reaches light, fluffy consistency.
07 - Scoop chilled sorbet into serving bowls or dessert glasses. Garnish generously with fresh mint leaves and serve immediately.