Step 1

In a large bowl, mix first 4 ingredients; cut in butter and shortening until crumbly. Whisk together egg, water and vinegar; gradually add to flour mixture, tossing with a fork until dough holds together when pressed. Divide dough in half so that 1 portion is slightly larger than the other; shape each into a disk. Wrap; refrigerate 1 hour or overnight.

Step 2

Preheat oven to 425°. On a lightly floured surface, roll larger portion to a 1/8-in.-thick circle; transfer to a 9-in. deep-dish pie plate. Trim crust to 1/2 in. beyond edge of pie plate. Refrigerate until ready to fill.

Step 3

Roll smaller portion of dough to 1/8-in. thickness. Cut with a small floured pumpkin-shaped cookie cutter; place some cutouts 1 in. apart on a baking sheet, reserving unbaked cutouts for decorative edge if desired. Bake until golden brown, 8-10 minutes.

Step 4

Meanwhile, beat together filling ingredients until blended; transfer to crust. Flute or decorate edge with unbaked cutouts, brushing off flour before pressing lightly onto edge. Bake on a lower oven rack 10 minutes. Cover edge loosely with foil. Reduce oven setting to 350°. Bake until a knife inserted near the centre comes out clean, 45-50 minutes.

Step 5

Cool on a wire rack; serve or refrigerate within 2 hours. Top with baked pumpkin cutouts before serving.