01 - Combine sugar and water in a small saucepan. Heat over medium heat while stirring until sugar dissolves completely. Remove from heat and let cool to room temperature.
02 - In a mixing bowl, blend together orange juice, lemon juice, lime juice, orange zest, lemon zest, and salt. Stir in the cooled syrup until fully incorporated.
03 - If desired, incorporate vodka or limoncello and mix thoroughly.
04 - Place the mixture in the refrigerator and chill for at least 1 hour to develop flavors.
05 - Pour chilled mixture into an ice cream maker and churn following manufacturer’s instructions for approximately 20 to 25 minutes until thickened and frozen.
06 - Transfer the sorbet into a freezer-safe container, cover, and freeze for at least 3 hours until fully set.
07 - If an ice cream maker is unavailable, pour mixture into a shallow tray, freeze for 1 hour, then stir vigorously with a fork. Repeat stirring every 30 minutes until smooth and frozen.