Adjusting the thickness of cauliflower soup is simple. If you prefer a thicker consistency, you can simmer the soup uncovered for an additional 5-10 minutes to allow some of the liquid to evaporate. Alternatively, you can blend a small portion of the soup and then mix it back in to thicken it. If you find the soup too thick, just add a bit of vegetable broth or water to thin it out to your desired consistency.