For the Pumpkin Filling
1. Remove the vegan pastry from the refrigerator and, on a floured surface, roll it out with a rolling pin to a thickness of about half a centimeter (¼ inch). If the dough is difficult to work or too crumbly, slightly wet it.
2. Oil the mold and spread the oil with absorbent paper. Cover and “flour” it with cocoa powder, removing the excess. Arrange the pastry in the mold and let it rest in the fridge for about 10 minutes.
3. Prick the base with a fork, cover with parchment paper, and place a weight on top (e.g., beans). Bake in a preheated oven at 200°C (392°F) for 10 minutes.
4. Remove the weight and parchment paper, stuff the pastry with the pumpkin-based mixture filling, and bake in a preheated oven at 180°C (356°F) for about 50 minutes.
5. Prepare the cake in advance, so that it has time to set before it is served.