Stir 700 g of sugar into 400 ml of water, bring to the boil and allow to cool. Puree the raspberries and brush through a hair sieve so that there are no more seeds in the fruit mass.
Add the cooled sugar water with lemon juice and vodka to the raspberry mixture and stir. Bottling and chilling.
Since it has a limited shelf life, it can also be frozen. If you freeze it in the ice cube tray, you can fill it up with sparkling wine later.