Pour the pear juice into a large pan. Add the vanilla pod, golden caster sugar, cardamom pods and root ginger, then bring to a simmer. Leave to cool completely, then strain into a punch bowl or jug.

Add the raw apple cider vinegar, rosewater and sparkling water. Garnish with rosemary sprigs, thyme, sliced red pear and a handful of frozen redcurrants. Add ice and serve.