Combine the red wine with the sugar and lemon rind and bring to a simmer over medium heat. Reduce the heat to low and cook for about 1 hour, until the mixture is reduced by about half. Add the lemon juice, red wine vinegar, blackcurrant cordial and mix well. Allow to cool, then return to the wine bottle and chill.

To serve, mix the cordial with sparkling water to taste over ice and garnish with summer berries and mint leaves.

Try with: Adam Liaw's chilli prawn sandwiches.