A friend of mine recently made a delicious cauliflower soup, and though I've been begging for the recipe I can't seem to get it from him. That said, I have a head of cauliflower sitting in my fridge and would love to make the soup tonight- any suggestions? The key characteristic that I loved about this soup was it's lightness- it had almost a foamy consistency. Any recipes / trickswould be very much appreciated- thanks!!