01 - Slice off the top third of each lemon and reserve as caps. Use a small spoon or paring knife to carefully scoop out the pulp, creating hollow lemon cups. Avoid puncturing the lemon shells.
02 - Strain the lemon pulp through a fine mesh strainer to remove seeds and pulp, yielding approximately 1/2 cup fresh lemon juice.
03 - Combine granulated sugar and water in a small saucepan. Warm over gentle heat, stirring until the sugar fully dissolves. Remove from heat and allow to cool.
04 - In a mixing bowl, stir together fresh lemon juice, lemon zest, and the cooled syrup. Refrigerate the mixture for at least 30 minutes until thoroughly chilled.
05 - Transfer the chilled mixture to an ice cream maker and churn according to the manufacturer's instructions, typically 20 to 25 minutes, until the sorbet has a slushy consistency.
06 - Carefully spoon or pipe the finished sorbet into the hollowed lemon shells. Replace the reserved caps on each lemon. Arrange upright on a tray and freeze for 3 to 4 hours or until firm.
07 - Present the frozen lemon sorbet shells with a fresh mint sprig or a light dusting of powdered sugar if desired. Serve immediately.