If you want a most watery soup you can put in less cauliflower. I cooked the whole thing in my thermomix, if you have a blender that heats up you can easily do it all in the one go. Otherwise it's simple cooking everything, then blending at the end.
2. Chop the mushrooms and cauliflower into small pieces and sautee with all the ingredients with 1 cup of vegetable stock over a low heat for about 10 mins.
3. Add the rest of the stock and heat in a pot for a further 10 mins.
4. Blend on a med-high setting to get a soup consistency. If you want small chunky bits in the soup blend it on a med setting.
* If you are using a thermomix or a blender that cooks as well, simple combine all the ingredients, chop first, then cook for 15 mins before blending it up