Using a vegetable peeler, pare the zest from half the orange and the half lemon, then squeeze the juice from each fruit.

In a large saucepan over a medium heat, bring the orange and lemon zest, wine, ginger, spices, herbs, sugar and blackberries to the boil. Reduce the heat to low and simmer for 10 minutes. Strain the liquid into a clean pan and return the cinnamon stick to the strained mixture.

Add the pears and any juices and simmer over a very low heat for about 45 minutes, or until the pears are tender, turning once.

Lift the pears carefully from the liquid and set aside. Simmer the sauce until the volume of liquid is reduced by two-thirds, then strain through a fine sieve.

The pears can be eaten warm or at room temperature. Pour the sauce over the pears and serve alongside custard or ice cream.