• 100 ml (3½ fl oz) cherry juice
• 100 ml (3½ fl oz) blood plum juice
• 4 g (⅛ oz) xanthan gum
• 50 ml (1¾ fl oz) cherry vinegar

Combine the fruit juices and then whisk in the xanthan gum until thickened. Add the cherry vinegar and strain through a fine sieve.