Preheat oven to 350 degrees F. Peel, core and quarter the pears (and the apple, if you are adding one). Place in a large saucepan along with 4 cups water, sugar, cinnamon stick and orange zest.. Bring to a simmer and continue to simmer until mixture becomes syrupy and pears are fork tender. Allow this mixture to cool.
While the pears are cooling, pat one pie crust into a greased 9" x 8" square baking dish. Drain the pears, reserving 1/3 cup of syrup. Discard the cinnamon stick. Stir the vanilla into the reserved syrup. Pour the pears over the pie crust. Pour the syrup over all. Sprinkle with sugar, nutmeg and dot with butter. Sprinkle the flour over the fruit. You can place the entire second crust over the pears or make a lattice topping. Sprinkle with remaining cinnamon, sugar and melted butter. Bake for 45 minutes until golden brown.