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Step 1
Finely grate the zest from the lemons and place in a large glass bowl with caster sugar. Rinse pearl barley and add to the bowl with 1.2 litres boiling water. Stir well and leave to cool.
Step 2
Squeeze the juice from the lemons and mix into the cooled barely water. Strain through a sieve and chill. Serve with lots of ice.