I love pumpkin soup but haven't made it in a while, got the recipe from a Pierre Bensusan music book.
Those big "Jack-o-Lantern" pumpkins are probably best consumed by sheep because they're not much good for cooking. I found that out the hard way when I was put in charge of making the filling. What you want is a smaller "sugar pumpkin", they show up in the stores here around T-giving.