2 cups freshly squeezed lemon juice (about 6 large lemons)
1–2 tbsp. lemon zest
2” piece fresh ginger, finely grated
In a saucepan, whisk together the water and granulated sugar and bring to a boil. Boil, whisking occasionally, until the sugar has completely dissolved (1-2 minutes). Remove from heat and stir in the grated ginger. Allow to cool to room temperature.
Whisk in the lemon zest and lemon juice, and transfer to a freezer safe container (a loaf pan works well for this). Freeze until firm (about 2-3 hours), stirring occasionally with a fork to break up any ice crystals.