I honestly think that cooking and pureeing fresh pumpkin is way more trouble than it's worth. More than that, I think canned pumpkin actually tastes better in pumpkin pie. Fresh pumpkin can have a grainy texture and a slightly grassy flavor. So unless you have a garden full of pumpkins that you don't want to go to waste, do yourself a favor and just pick up a can of pumpkin at the supermarket.