This is an easy, delicious soup that I like to serve for company.
Just peel and dice a bunch of potatoes and several onions. Add some cauliflower and a handful of mushrooms. Add almost enough water to cover. Bring it to a boil and let it simmer until all the vegetables are soft, about 45 minutes. Puree it in a blender and serve. You can dress it up with a few mushrooms sauteed in red wine, or you can serve it with a few drops of sherry.