Heat the water and sugar in a medium saucepan until sugar is dissolved. Remove from heat and stand to cool slightly; stir in limoncello and chill. Pour into a shallow freezable dish about 8” x 8”, cover and freeze for 4 hours. Scrape the top with a fork until mixture is slushy. Return to freezer for at least 2 more hours; scrape with a fork again until light and icy. Freeze for at least 2 hours again. Spoon into small dishes and garnish with a small piece of lemon and mint sprigs.
Recipe by appetite magazine at https://www.appetitemag.co.uk/ludovici-limoncello-granita/