Pumpkin Peanut Butter Soup

I'd love to take credit for this one, but a friend emailed me a link from Chef In You to this recipe when I had a wierd urge to make something with peanut butter and pumpkin. This soup is simple, healthy and thick and DELICIOUS. It is now one of my favourite things...made some fresh cheese rolls to have with it and even J, who is Mr. Meh when it comes to soup, loved it. I doubled the recipe and had a few yummy easy lunches for later in the week.
I'm reposting the recipe in case the link goes away (it would be tragic):
1 c pumpkin puree
1 medium sweet potato
1/4 c peanut butter
1 T butter
~1-2 cups vegetable stock or water (to thicken to desired consistancy. I used 1 1/2)
Salt and freshly ground pepper to taste

Chop up the sweet potato roughly and steam until soft. Blend it into a puree. In a pan, melt the butter in low heat, then add potatoes, pumpkin and peanut butter. Add the stock/water and seasoning. Stir until it becomes smooth and well blended. Cook for about 10 minutes. Enjoy. :)