1

Use a potato peeler to pare the zest from the lemons. Make sure you only remove the yellow part as the white pith is bitter. Cut into thin strips.

2

Put lemon zest into a saucepan with 500ml boiling water. Simmer gently for 10 minutes, then remove from heat. Squeeze the lemon juice and add to mixture. Leave until cold, then stir in the stevia.

3

Share between 6 tall glasses, adding a mint sprig and two strawberry halves to each one. Top up with ice cubes and sparkling water, and serve at once.