Crush the crackers/biscuits and pecans in a food processor. Add the melted butter, stir to combine.
Divide this mixture between 8 (6oz) custard cups/ramekins, and press to form a base.
Pour 2 cups of cream into a sauce pan and add cinnamon, nutmeg, and ginger.
Split the vanilla pod lengthways, and scrape out the seeds. Add the seeds and the pod to the cream pan.
Bring the cream slowly to a boil on the stove top, then remove pan and leave to cool slightly. Remove vanilla pod.
Meanwhile, add the white, and dark brown sugars and egg yolks to a bowl, and beat with an electric mixer until the sugar is dissolved.
To the cooled cream and spices, add the other 1½ cups of cream and the milk. Then carefully and slowly whisk in the sugar and egg mixture—you do not want to create scrambled eggs!
Whisk the pumpkin purée into the spiced cream mixture until incorporated.
Place the prepared ramekins into a deep roasting tray, and divide the custard between them. Fill to just below the top.
Pour boiling water into the roasting pan, about halfway up the sides of the ramekins. This is called a bain-marie (water bath)
Place the pan into an oven set at 150C/300F/Gas 2 for 35-45 minutes until set. They should be firm to the touch, and have a slight jiggle—but not too much!
Remove the ramekins from the bain-marie and leave to cool for 30 minutes, before placing in the refrigerator to cool and set completely. At least 6 hours to overnight for best results.
When ready to serve, brûlée the tops of the dessert by sprinkling with turbinado sugar, and using a culinary blow torch to melt the sugar until dark and almost burnt. (Crème brûlée, means burnt cream!)
Serve and enjoy!