Roll out the pastry and line a 20cm tart tin. Sprinkle with cinnamon and chill for 30 minutes.
Combine pumpkin, single cream, sugar, nutmeg, and ginger in a saucepan. Simmer until tender, purée, and cool.
Blind bake the pastry at 200°C for 15 minutes with baking beans, then remove and bake for 5 more minutes. Reduce oven to 180°C.
Whisk eggs and butter into the purée, pour into the crust, decorate edges with pastry shapes, and bake for 30–40 minutes until slightly wobbly in the center.
Whip double cream and fold in maple syrup. Serve with the pie.