Halloween has passed - I am on an all pumpkin diet
Start with a pumpkin about the size of a volleyball (It won't matter if it is too small or too big - you can correct that later). Heat the oven to 400 degrees Fahrenheit. Roast the pumpkin in a roasting pan (to catch any juices that escape) for one hour. Let the pumpkin cool, then cut it in half, remove the seeds, and scoop out the pulp.
Slice two yellow onions, then saute them in oil or butter until translucent in a stock pot. Add the pumpkin pulp, any of the escaped juice, and six cups chicken stock or vegetable stock (Trader Joe's has good stock - it comes in a cardboard box). Heat to a boil, then reduce to a simmer. Simmer for half an hour. Remove from heat.
Remove the solids and puree in a blender, working in small batches (work carefully - blenders don't like having hot items in them). (A food mill would work here too). Put the puree in a large bowl. Add the liquid from the stock pot to the puree until you reach the consistency of soup you desire.
Reheat the soup. Add salt and pepper to taste.
Ladle into serving bowls, stir in some grated Gruyere cheese.
Now let's try for an ingredient list:
1 pumpkin, about so big
2 yellow onions, sliced
some butter or oil
6 cups chicken stock or vegetable stock
salt and pepper
Some grated Gruyere cheese
To make the soup even better, add the remains of the pumpkin (skin, seeds, messy stringy things...) to the stock, simmer for half an hour, then strain.