Peel the pears, and place in medium saucepan. Add wine, sugar, vanilla bean, cinnamon stick, orange peel, lemon peel, cloves, star anise, bay leaf, and just enough water to cover pears. Set saucepan over high heat, and bring liquid to a boil. Reduce to a simmer, and cook, occasionally stirring gently, over medium-low heat, until a paring knife easily pierces pears, about 15 minutes. Remove pan from heat; let pears cool in liquid. Using a slotted spoon, transfer pears to a plate. Pour poaching liquid through a sieve set over a bowl. Discard solids, and return liquid to saucepan. Place over medium-high heat, and cook until liquid has been reduced to a syrup that coats the back of a wooden spoon, about 45 minutes. Let cool; store pears in an airtight container until ready to serve. When ready to serve, arrange pears on a platter or on individual plates, and drizzle poaching liquid over them.
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