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I usually just buy them. However, if you are going to make one from scratch, you can use the canned pumpking and they turn out just as well. I wouldn't bother using a fresh pumpkin.. to much trouble.
I don't think we have canned pumpkin over here Audrey, I certainly have never seen it. Fresh ones are two for £3 at sainsburys at the moment which is why this has arisen as a task.