Leave to cool completely before taking out of the ring or tin.
Remarks
In stage 5 you can cut the citrus slices into smaller pieces if you prefer, as this makes cutting the tart into potions easier.
Depending on the ripeness of your fruit, they may well produce more juice, even after poaching. To err on the safe side, use a tin or mould rather than a dessert ring in stage 6, to be sure any juice stays in the tart.
You can use any type of citrus fruit for this recipe, but it is important to choose organic, as the peel will be used.
The star anise can be replaced with cardamom, if you prefer.