Start by making the dried orange slices to garnish. Spread out the orange slices on a lined baking tray. Heat oven to 110C/90C fan/gas 1/4 and cook for 2 hrs. Can be made a day ahead and stored in a container.

Pour the orange juice, vodka and cinnamon syrup into a cocktail shaker and add a couple of handfuls of ice. Shake well, then strain into two large wine glasses with more ice. Top up with cava and garnish with a slice of dried orange.