On a lightly floured surface, roll dough to a 1/8-in.-thick circle; transfer to a 9-in. pie plate. Trim crust to 1/2 in. beyond rim of plate; flute edge. Refrigerate 30 minutes. Preheat oven to 400°., Line unpricked crust with a double thickness of foil. Fill with pie weights, dried beans or uncooked rice. Bake on a lower oven rack until edge is light golden brown, 15-20 minutes. Remove foil and weights; bake until bottom is golden brown, 3-6 minutes longer. Cool on a wire rack. Reduce oven setting to 350°., For topping, in a food processor, combine crushed cookies, flour, brown sugar and salt. Add butter; pulse until crumbly., For filling, in a large bowl, mix sugar, flour, ginger and salt. Add pears, lemon juice and vanilla; toss gently to combine. Transfer to crust; cover with topping., Place pie on a baking sheet; bake until topping is lightly browned and pears are tender, 60-70 minutes. Cover pie loosely with foil during the last 15 minutes if needed to prevent overbrowning. Remove foil. Cool on a wire rack at least 1 hour before serving. If desired, drizzle with caramel topping.