To prepare star fruit, cut off the ends and slice the fruit into thin pieces. Use the tip of the knife or fingers to remove the seeds as they can be bitter.
In a small saucepan, combine the sugar and water and stir over low heat until the sugar has dissolved. Add the lemon juice and bring to a boil. Remove from heat and let cool.
Place the star fruit in a blender or food processor and add the sugar syrup. Puree until smooth. Serve over ice or chilled.
Notes
Lemon adds taste and ensures that the sugar and water mixture stays clear when it boils.