Preheat the oven to 375°F.
Using a paring knife, carefully cut into the flesh of the pumpkin around the stem. Create a hole big enough to fit a spoon or your fingers inside.
Pull the top of the pumpkin off.
Hollow out the pumpkin, scraping out any seeds and strings of flesh.
In a small bowl, mix together the water, coconut oil, sugar and cinnamon.
Pour the mixture into the pumpkin, coating the insides of the pumpkin. Don't forget to put some on the inside of the lid!
Place the lid back onto the pumpkin.
Put the pumpkin in a shallow, oven-proof pan filled with about 1" of water.
Bake in the oven for 30-40 minutes. The pumpkin is done when the inside flesh is tender.