Place the red wine in a large saucepan and bring to a simmer add the cinnamon sticks, vanilla pod, lemon zest, ground cloves and Cointreau and simmer for 5 minutes, then add the pears and sugar.
Partly cover and simmer over a very low heat for about 1 hour until the pears are tender.
Carefully remove the pears with a slotted spoon and place in a heatproof serving dish.
Strain the remaining red wine mixture and return to the saucepan bring to the boil and cook rapidly until it reduces and thickens into a syrup, pour the red wine syrup over the pears.
Serve warm or cold and enjoy!