1. Prepare and roll out pastry. Line a 9-inch pie plate with pastry. Trim; crimp edge. In a large bowl stir together eggs, pumpkin, and half-and-half or milk. Stir in the granulated sugar, flour, lemon peel, vanilla, salt, cinnamon, nutmeg, and allspice. Pour pumpkin mixture into pastry-lined pie plate. Cover the edge of the pie with foil to prevent overbrowning. Bake in a 375 degree F oven for 25 minutes.
2. Meanwhile, in a medium bowl stir together the brown sugar, pecans, and butter until combined. Remove foil. Sprinkle brown sugar mixture over top of pie. Bake for 20 minutes more or until a knife inserted near the center comes out clean and topping is golden and bubbly. Cool on a wire rack. Cover and refrigerate within 2 hours. Makes 8 servings.