Brûléed Bourbon-Maple Pumpkin Pie

Pulse cocoa powder, granulated sugar, salt, and 1 1/4 cups plus 1 tablespoon flour in a food processor to combine. Add butter and shortening and pulse until mixture resembles coarse meal with a few pea-size pieces of butter remaining. Transfer to a large bowl. Whisk egg yolk, vinegar, and 1/4 cup ice water in a small bowl. Drizzle half of egg mixture over flour mixture and, using a fork, mix gently just until combined. Add remaining egg mixture and mix until dough just comes together (you will have some unincorporated pieces). Turn out dough onto a lightly floured surface, flatten slightly, and cut into quarters. Stack pieces on top of one another, placing unincorporated dry pieces of dough between layers, and press down to combine. Repeat process twice more (all pieces of dough should be incorporated at this point). Form dough into a 1"-thick disk. Wrap in plastic; chill at least 1 hour. DO AHEAD: Dough can be made 2 days ahead. Keep chilled, or freeze up to 3 months.