Bake your Halloween jack o'lantern in the oven.
(watch the face distort and shrink - it's fun!)
Strain your pumpkin, saving the juice separately from the strained pumpkin.
Serve your chilled pumpkin juice to your guests!

This takes a good hour or two, depending on the size of your jack o'lantern, so keep checking your pumpkin as it is baking. Use a cookie sheet underneath so you can easily take the hot mushy pumpkin out of the oven and to catch any drippings. If your pumpkin was not carved, cut it in half before baking, otherwise it could explode and make a GIGANTIC mess! You will see that the juice separates from the pumpkin flesh as it starts to bake, so spoon off this juice periodically and save it so it doesn't leak all over your oven. Once your pumpkin flesh has baked long enough to be good and soft, remove from the oven and let it cool. Scoop the pumpkin flesh from the skin into a strainer with a container underneath. Use a spoon to squeeze out the juice from the pumpkin, so you have as "solid" a puree as possible, which you should save for your Pumpkin Pasties, pumpkin bread, or your favorite pie recipe.