Heat the water and sugar in a pan until the sugar has dissolved, then add the blackcurrants and lemon zest.
On medium to high heat, cook for about 10 minutes so that the blackcurrant becomes soft and begins to burst. Add the lemon juice and stir through.
Sieve the mixture through some muslin cloth on top of a fine sieve. Use a sterilised glass jug to capture the syrup. Then transfer to a sterilised bottle/s.
Seal and allow to cool. Dilute according to taste. Serve with still or sparkling water.
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