1. Cut the lemon into slices, place them in a pan with the red wine, sugar, cinnamon, ginger and truffle olive oil and bring to the boil. Simmer over low heat for 10 minutes.
2. Peel the pears but keep their stems. Remove the ginger, cinnamon and lemon slices from the red wine and place the pears upright in a fairly deep saucepan.
3. Pour the wine over the pears so that they are covered with wine, cover with a lid and simmer over low heat for 10 minutes.
4. Remove the pears from the pan and place them, cut in half lengthwise, on soup plates. Bring the red wine to the boil until it has the consistency of syrup. Pour over the pears, sprinkle with truffle-flavoured Guérande salt and serve immediately.