I half filled a large pot with water and chucked in a chicken stock cube. Then I emptied the veg rack of aging sweet potatoes ... about 8-10 small I think, chopped them into chunks and tossed them into the pot. I then skinned and chopped up 2 portobello mushrooms, in they went. I also chucked in 4 chestnut mushrooms as well (any mushroom would be lush it's what I had in the fridge). Let it simmer until the sweet potato is soft then blitz with a handheld mixer. Taste. Add salt and/or pepper to taste.
Whammo, you are done. I got 8 portions out but as per pic I like to add chicken to mine. This would be equally tasty with a dollop of creme fraiche and/or a slice of chunky fresh bread.
It's a perfect bowl of winter warmness. Enjoy.