Steps
- Zest the lemons with a microplane.
- Add the sugar to the zest and stir until all the zest is coated. Leave it to rest while you do the next steps.
- Juice the lemons.
- Strain the juice into a jug, keeping only the liquid and discarding the pulp and seeds.
- Drop the ice into the jug.
- Pour the water onto the sugar-zest mixture and stir continuously until fully dissolved, about 1 minute.
- Strain the syrup into the jug, discarding the zest.
- Wait until the ice has dissolved, stirring occasionally, then serve.