Photograph: Dan Jones
Dissolve the caster sugar in 300ml water with 2 strips of lemon zest, and simmer for 5 minutes.
Transfer to a bowl and mix with the pomegranate juice and lemon juice. Chill for at least 1 hour until cold.
To serve, pour the chilled syrup into a large pitcher over ice cubes and add the bottle of pink Champagne or sparkling wine. Decorate with srips of lemon zest and pomegranate seeds.