There's another very easy soup and cheapo to make. Peel and chop carrots, toss in a little butter over a gentle heat. Add vegetable or chicken stock to just above the vegetables and simmer until cooked. Mash or blend (it'll be quite thick) and add a little milk or more stock if you want it thinner. Lovely with garlic bread or croutons and black pepper.
Even people who don't like carrots have been known to enjoy this.