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In a large jug stir together the lime juice, the pulp from two passion fruits, Green Boost, mint, rum and sugar syrup. Muddle it all together with a wooden spoon and place in the fridge until ready to serve.
Strain the contents of the jug through a sieve when ready to serve. Fill two glasses with ice and place in the sliced lime. Divide the fruity liquid between the two glasses, top up with soda water and decorate with the passionfruit halves and extra mint sprigs. Enjoy!