Make the crust: Place the flour and salt in the bowl of a food processor fitted with the metal blade. Add the butter and pulse 10 times.
Turn the food processor on and slowly pour in 2 Tablespoons ice water. Stop the machine and carefully (watch the blade!) grab a small handful of dough and squeeze it in your hand. If it holds together well, you’re done. If it’s crumbly, add another tablespoon of ice water and blend. The goal is that when you squeeze the mixture in your hand that it forms a moist, but not sticky ball of dough. Transfer the dough to a piece of parchment paper or plastic wrap and shape into a disc. Wrap well and refrigerate for at least 30 minutes.
Preheat the oven to 375 degrees. On a lightly floured work surface, flour a rolling pin and roll dough into a 12-inch round. While you’re rolling out the pastry, you should always be able to move it easily around the work surface without sticking. Add additional dustings of flour as needed. Fit the circle into a 9-inch pie plate and crimp edges. Refrigerate if it feels too soft.
Prick the bottom of the crust all over with a fork. Line the crust with a piece of parchment (like the one the dough was wrapped in), and fill it with pie weights or dried beans (the ones in the photo I've had since college!). Bake until lightly golden around the edges, about 20 minutes. Remove parchment and weights. Return crust to the oven and bake for another 5 minutes until light golden all over. Cool completely on a wire rack (this can take up to an hour so you may want to turn the oven off.)
Preheat the oven again to 375 degrees. In a small bowl, whisk together the salt and spices (if you are using brown sugar instead of syrup, add the sugar now.)
In a large bowl or with a mixer, whisk together cream, pumpkin puree, eggs and maple syrup. Add spice mixture and combine thoroughly.
Pour mixture into the cooled crust and bake until filling is set (it will jiggle like gelatin, but it will be a little soft in the center), about 50-60 minutes. The filling will firm up as it cools. This can be made the day before. I like to keep it refrigerated.