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 mint leaves to hot syrup, gently bruising with a spoon to release oils. Cover and let steep for 10 minutes.
03 - Pour syrup through fine mesh strainer into mixing bowl, pressing firmly to extract maximum mint flavor. Discard spent mint leaves.
04 - Whisk lemon juice, cranberry juice, and lemon zest into 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 frozen edges with fork to break ice crystals. Repeat scraping every 30–45 minutes for 3–4 hours until mixture reaches light, fluffy consistency.
07 - Scoop into chilled bowls and garnish with fresh mint leaves. Serve immediately.