250ml (1 cup) cold water
215g (1 cup) caster sugar
8 limes, halved, each half cut into quarters
330ml (1 1/3 cups) chilled vodka
4 cups crushed ice
1. Place the water and sugar in a medium saucepan over medium-low heat. Cook, stirring, for 5 minutes or until the sugar dissolves. Remove from heat and set aside for 5 minutes to cool. Transfer to a jug. Cover with plastic wrap and place in the fridge for 1 hour to chill.
2. Place 3/4 of the lime wedges in a large bowl. Use the end of a rolling pin to gently pound until roughly crushed.
3. Add the sugar syrup, vodka and crushed ice, and pound until just combined. Pour among 8 serving glasses. Top with remaining lime wedges and serve immediately.