Add the remaining grapes at the very last minute, then watch them liven up your drink as they jump around, making ever more bubbles.
5-6 red or black grapes
Splash of mandarin liqueur
Pink champagne or sparkling wine, chilled
1. Save two grapes for the glass.
2. Crush or muddle the others in a small bowl to let the juice flow.
3. Add ice and liqueur, stir well and strain into a chilled champagne glass.
4. Top up with champagne, halve and pip the remaining grapes and add to the glass.