Preheat oven to 400℉.
Carefully cut pumpkin in half and scoop out the insides. The scooped-out insides can be composted or discarded. Alternatively, you could use the seeds to make roasted pumpkin seeds.
Sprinkle a little bit of salt on the pumpkin.
Place pumpkin halves cut-side down on a baking sheet lined with parchment paper.
Bake in oven for 45-60 minutes, until the skin starts to wrinkle and the flesh pulls away from the skin.
Remove from oven, turn oven off, and let pumpkin cool until it is safe to handle.
Scoop pumpkin flesh out of the skin and transfer to a food processor. Depending on the size of the pumpkin and the size of the food processor, this may need to be done in batches.
Puree with food processor until a smooth consistency is achieved. Scrape down sides and stir pumpkin, as necessary, to achieve this smooth consistency.
Puree may be stored in the fridge for a few days or in the freezer for up to three months. If freezing in jars, ensure the jars are freezer-safe and are straight-sided (and do not have "shoulders", as this can lead to breakage if the puree expands while freezing).
Homemade pumpkin puree is often a little waterier than store-bought puree, so when adding puree to recipes, adjust accordingly.