With a sharp-edged spoon (I use a metal tablespoon with a sharp edge or you can use a metal ice cream scoop), scoop out the seeds & guts.
Place the pumpkin wedges on a baking sheet skin-side down. Roast for 45 to 50 minutes until the skin begins to shrivel and the pumpkin is fork tender. Remove from the oven and let it cool until you can tough it. Remove the pumpkin from the skin and discard any pieces on top that may be tough.
Add it to a food processor or high-powered blender and puree until smooth. If the pumpkin seems dry, add a few tablespoons of water until it is moist and resembled the puree you see in a can. Store pumpkin in the fridge in a sealed container.