Place all the ingredients in a Kilner jam pan and pour over 350ml cold water.
Bring to the boil, stirring often, then leave to cool.
Pour through a sieve, pressing down with a spoon to extract all the juices.
The syrup can now be stored in the fridge for up to 1 week.
To serve, pour a little into a glass and top up with sparkling or still water, ice and mint.
The Kilner 0.5 Litre preserve Jar is ideal to serve the lemonade in.
Recipe courtesy of Kilner