Place the pumpkin cubes into a large pot and cover the pumpkin pieces with water.
Bring to a boil over high heat and then lower to medium.
Boil for 30 minutes and check to see if the pumpkin is soft, If not boil until soft.
Remove from water and let cool.
Place in a food processor or Ninja and blend until smooth.
To Roast:
Preheat your oven to 375*F.
Line a baking pan with parchment paper, set aside.
Cut the pumpkin in half and clean out the seeds.
Place the pumpkin face side down on the prepared baking sheet.
Roast the pumpkin for 45 minutes and check to see if it is tender, if not, continue to roast until it is tender.
Remove from oven and let cool.
Mash the pumpkin with a fork or blend in the food processor until smooth.
Notes
Use this puree in everything that you would usually use canned pumpkin.
Store in an airtight container for about a week in the fridge or a few months in the freezer.