6 large unwaxed lemons
1.2 litres/2 pints/5 cups boiling water
1–2 tbsp sugar
sparkling water to serve
1 Remove the zest in thin strips from 3 lemons. Place in a large jug with the squeezed juice of all 6 lemons. Add the boiling water and sugar and set aside to cool.
2 When completely cool, cover the jug and chill in the refrigerator overnight.
3 Strain the lemonade through a sieve or some muslin (cheesecloth) and store in corked bottles in the refrigerator. Serve over ice diluted with sparkling water.