For pumpkin puree, I always like to use fresh roasted pumpkin. I never use canned pumpkin. I usually roast a whole pumpkin in advance and save some for later. Cut the pumpkin into thick slices and place on a parchment paper-lined baking sheet. Bake at 350F (180C) for about 45 minutes to 1 hour or until tender. Let it cool down. Scoop out the pulp and puree in a food processor until smooth. Refrigerate the puree or freeze it for later use.