Peel and chop the pumpkin and remove the seeds.
Heat the oven to 180C Gas Mark 4
Place the pumpkin chunks into a roasting tin, add 3 tbsp of water and cover with foil.
Make a small steam hole in the foil then bake in the oven for 45 minutes until the pumpkin is tender.
Leave to cool.
Place the seeds on a baking tray and cook in the oven for ten minutes until toasted.
Add the toasted pumpkin seeds and the ginger nut biscuits into a food processor and process until they become crumbs.
Melt the butter and add to the mixture, processing until it is like wet sand.
Place into a greased pie dish and press down with a spoon until the bottom and sides are covered evenly.
Leave in the fridge to chill for 30 minutes.
Turn the oven to 160C Gas Mark 3
Get the cooled pumpkin, drain the liquid and add to the cleaned food processor.
Add the remaining ingredients for the filling and mix until smooth.
Pour into the base and place in the oven for 40 minutes until the filling is set (It should still wobble a little)
Leave to cool and then whip the cream and add to the top.