Wash and cut your pumpkins into large chunks. Remove the seeds. (These can also be roasted for a delicious and healthy snack!)
Place pumpkin pieces on a buttered or parchment-lined baking sheet.
Bake at 350°F (175°C) for about 45 minutes, until a knife can be inserted easily into the skin of the pumpkin.
Let the pumpkins cool, and scoop out the flesh with a large spoon.
Puree the flesh until smooth, adding a little water if necessarily.
Use immediately, or freeze in small bags for later use.