- 1.5kg/3lb 5oz caster sugar
- 2 lemons
- about 25 heads elderflowers
- 50g/1¾oz citric acid
- 2 Campden tablets
- Put the sugar and 1.5 litre/3lb 5oz water into a large pan. Bring to the boil, stirring, until the sugar has dissolved. Remove from the heat and cool.
- Slice the lemons thinly. Put into a large plastic box or a bucket.
- Add the elderflower heads to the lemons with the citric acid and the Campden tablets. (CAUTION: Campden tablets produce an irritant gas if inhaled. Keep your face well back from the mixture.) Pour over the cooled sugar syrup. Cover and leave overnight or up to a couple of days.
- Sieve and strain through muslin into sterilised bottles and store in the fridge. To serve, dilute to taste with still or sparkling water.