Halve pumpkin if necessary and scoop out any seeds and stringy portions. Cut pumpkin into chunks.
In a saucepan over medium heat, cover the pumpkin with water and bring to the boil. Reduce heat to low, cover and simmer for 30 minutes or until tender. Drain, cool and cut away the skin.
Return pumpkin to the saucepan and mash with a potato masher. Drain well, and measure 500g of the mashed pumpkin; reserve any excess pumpkin for another use.
Prepare pastry by mixing together the flour and salt. Rub butter into flour, and add 1 tablespoon cold water to mixture at a time. Mix and repeat until pastry is moist enough to hold together.
With lightly floured hands, shape pastry into a ball. On a lightly floured board, roll pastry out to about 5mm thickness. Transfer to a 20-23cm pie dish, gently pressing pastry into the base and up sides.
Cut off any excess pastry hanging over the sides of the dish, and pinch pastry securely around the inner edge.Refrigerate any remaining pastry for another time.
In a large bowl with mixer speed on medium, beat pumpkin with evaporated milk, eggs, sugar, cinnamon, ginger, nutmeg and salt. Mix well.
Pour into a prepared pie dish. Bake in preheated oven for 40 minutes or until a knife inserted in the centre comes out clean.
It is important to put evaporated milk in fridge and whip it when cold (step 8). I always whip the milk first, then add the other ingredients and fold them in till fully mixed. This gives more volume and cooks like a creamy pumpkin custard. my kids hate pumpkin, but love this dessert pumpkin pie. - 26 Dec 2011