01 - Combine sugar and water in a small saucepan. Heat over medium while stirring until sugar fully dissolves. Remove from heat and allow to cool to room temperature.
02 - In a mixing bowl, blend orange juice, lemon juice, lime juice, orange zest, lemon zest, and salt. Stir in the cooled syrup.
03 - Add vodka or limoncello to the mixture and mix thoroughly if using.
04 - Refrigerate the combined mixture for at least 1 hour to enhance flavors.
05 - Pour mixture into an ice cream maker and churn following manufacturer’s instructions, usually 20–25 minutes until thick and frozen.
06 - Transfer sorbet to a freezer-safe container, cover, and freeze for a minimum of 3 hours until set.
07 - If no ice cream maker is available, pour mixture into a shallow tray. Freeze for 1 hour, then stir vigorously with a fork every 30 minutes until smooth and frozen.