- 4 unwaxed lemons
- 75g caster sugar
- 10g Truvia Calorie-Free Sweetener
- 1.6 litre sparkling water
- Ice, to serve
Use a vegetable peeler to cut all the zest off the lemons – try not to peel away any of the pith. Cut the lemons in half and use a lemon juicer to squeeze them. Discard the seeds.
Put the juice and zest in a pan. Add the sugar and 750ml cold water. Bring to the boil. Simmer for 15 minutes. Stir in the sweetener and leave to cool, then chill for at least 1 hour.
Strain through a sieve into a large jug. To serve, dilute with the sparkling water. Add ice and lemon slices.