Boil the raspberries, water and sugar for 5 minutes.

Pass them through a sieve and chill for at least 4 hours.

Add the lime just before drinking it so it doesn't go bitter.

Turn the glass over a dish with a bit of water so the rim gets wet.

Repeat over brown sugar and let it rest for 5min so it dries a bit.

Fill 1/4 of the glass with the syrup and then fill the rest with sparkling wine. Add a few raspberries so they float around.