For the pumpkin jam, boil the pumpkin pieces with squeezed orange juice and the grated orange peel, star anise and cinnamon piece.
Cook until the pumpkin is soft. Remove the star anise and cinnamon and puree with a hand blender.
Weigh the puree again and add the same amount of preserving sugar.
Boil everything bubbling for about 4 minutes, pour the pumpkin jam into screw jars and let cool.