Makes: 1.2 litres/2 pints
Preparation time: 30 minutes
10 lemons, well scrubbed, thinly sliced, pips removed
100g (3½oz) citric acid
2.25kg (5lb) caster sugar
1.2litres (2 pints) boiling water
1 Put the lemon slices in a large heatproof jug/bowl, and add the citric acid.
2 Add the caster sugar, and then pour in the boiling water. Stir to combine and make sure the sugar is dissolved.
3 Leave to cool, then sieve and chill.
4 Pour some of the lemonade into a large jug with ice and some slices of fresh lemon. Dilute with cold water or soda water to taste.