A light, summery version of a traditional Brazilian cachaça.
Cut each lime in half and then each half into quarters and put into a large glass jug. Add the sugar and, using the end of a rolling pin, crush the limes to release their juice.
Add the vodka and the pulp from 3 passion fruits. Put the remaining pulp into a sieve and, using a spoon, press as much juice out as possible. Add the extra juice to the jug along with the tropical fruit juice, soda water and crushed ice. Mix well.
Make a sugar rim on the serving glasses by pouring a little water onto a side plate and golden caster sugar onto a second plate. Dip the rim of the glass into the water and then into the sugar. Fill the glasses with the caipivodka mix.
Garnish each drink with half a passion fruit if you like.
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