• Poke holes with a fork all over 1 sweet potato and microwave for 2 minutes, turn and repeat until the fork inserts easily. Repeat with the rest of the potatoes (depending on how many you have). Allow to cool.

To a make the pastry in a food processor

• Add the flour, sugar, salt and butter. Pulse until you get the texture of fine breadcrumbs. With the processor running, slowly drizzle in just enough cold water until it forms a ball. 

To make the pastry by hand:

• Add the flour, salt and butter to a large bowl. Using your fingertips (or a pastry cutter) rub the butter and flour until it resembles breadcrumbs. Drizzle in the water and mix using a fork until the it starts to come together and holds together when pressed in your hand. You may not need all of the water.
• Remove, knead a little on a floured board. Wrap in plastic wrap and refrigerate 10-15 minutes.
• While the pastry chills, when the potatoes are cool enough to handle, peel and add the sweet potato to a mixing bowl mash until smooth. Whisk in the sugar, cream, maple syrup, eggs, cinnamon and nutmeg.
• Preheat oven to 350°F/177°C and position rack on lower ⅓ of the oven.
• Remove the dough from the fridge and roll out onto a floured surface. The dough may be hard, don't worry, this is just the butter hardening. Leave out for a couple of minutes to soften, then start rolling.
• Roll the dough over the rolling pin and lift into a greased 9 inch pie dish. Leave a 1 inch overhang, then fold the edges under and make the edges pretty. Use a fork to prick holes in the base of the dough. Lightly cover the crust edge with foil.  Bake in the center of the oven for 10 minutes. Remove from the oven, remove the foil and allow to cool slightly.

Make the filling:

• To a mixing bowl, add the cooled sweet potato and mash until smooth. Add the sugar, cream, maple syrup, eggs, cinnamon and nutmeg. Whisk until mixed and smooth.
• Pour the filling into the pie crust, place on a baking sheet and bake for 50 minutes until the filling is set. It will still be jiggly. Remove from the oven and cool completely.