Preheat oven at 190C. Slice pumpkin in two and roast for one hour.
Remove the pumpkin from the oven and leave to cool. Once the pumpkin has cooled discard the stringy bits and scoop out the seeds. Rinse the seeds with water and pat them dry with a paper towel (or leave them to air dry).
Scoop out the remaining pumpkin and use as desired.