In a large saucepan, combine the water with the wine, sugar, sage, cloves, cinnamon and vanilla bean and seeds and bring to a boil. Simmer for 5 minutes, then add the quartered pears. Cover with a large sheet of parchment paper and a lid slightly smaller than the saucepan and cook over moderate heat until the pears are just softened, 25 to 30 minutes. Using a slotted spoon, transfer the poached pears to a paper towel-lined plate and let cool slightly. Cut each wedge in half lengthwise.