Cut this recipe out from a magazine last year, have yet to try it!
Add 250g sugar to 300ml water and bring to the boil in a small saucepan, stirring until the sugar is dissolved. Remove from the heat and allow to cool completely. Then put 300ml lime juice (about 9 limes) into a non reactive bowl and add 1.35kg cherries (pitted and halved). Stir in the syrup and refrigerate for an hour (no more than overnight). Stir 530ml vodka (black cherry or plain) into the cherry mixture. To serve, fill glasses with ice, spoon in the cherry vodka and top with sparkling water. Serve immediately.