Peel the pears keeping the stalks on.
Cut them in half lengthwise and remove the core using a melon baller or a metal measuring spoon. Also remove the bottom where the fibers are. For further reference watch the video above. Alternatively you could cook them whole or not remove the core if you prefer.
Put your pears in the pot together with the zests and spices, orange juice, lemon juice and wine. Top up with water to make sure the pears are covered.
Place a lid on the pot and slowly simmer them until you can easily go through them with a knife (15-30min depending on the ripeness of the pears). Remove them from the pot.
Strain the poaching liquid and discard the flavourings. If you want to make the pears go intensely purple then wait for the liquid to cool down and place the pears and liquid in a container. Keep in the fridge overnight. If you like them as they are then go on to the next step.
The last step is to reduce the juice into a syrup by boiling it until the bubbles become denser and start to come up the pot. Remove from the heat and cool down to room temperature. If by the time it cools down you realize it has thickened too much you can think it down with a bit of boiling water.
Place all ingredients in a bowl and whip until fluffy.