Select the raspberries and puree them finely in a blender. Add the juice of the lime, raspberry syrup and vodka and mix again briefly. Pour the raspberry limes into clean bottles, close and chill.
Shake the raspberry limes well before serving. Spread pure in shot glasses or pour into champagne glasses with Prosecco. Also delicious as a fruity sauce with vanilla ice cream and desserts. Shelf life in the refrigerator 5-7 days.