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Put 50ml coconut rum, 100ml pineapple juice, 25ml gin and 50ml cold water into each jam jar.
Stir, then garnish each one with a piece of watermelon and a couple of coriander sprigs, squeezing the leaves a little bit first before dropping them into the jars to help release the flavour. Screw on the lids and chill or set in ice buckets until needed – they will keep well for 4-6 hrs.