In a small bowl, mix flour, ginger, allspice and salt; cut in butter until crumbly. Gradually add ice water, tossing with a fork until dough holds together when pressed. Shape into a disk; cover and refrigerate 1 hour or overnight. , Preheat oven to 375°. 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. In a large bowl, whisk filling ingredients until blended; pour into crust. , Bake on a lower oven rack 50-60 minutes or until a knife inserted in the center comes out clean. Cool on a wire rack; serve or refrigerate within 2 hours., For whipped cream, in a small bowl, beat cream until it begins to thicken. Add maple syrup and cinnamon; beat until soft peaks form. Serve with pie.