We have just eaten the last of the Caulis in soup, very very nice:
Cut up one cauli into flowerets and put in pot with one leek, one carrot and one piece celery. Cover with 500ml chicken stock. Simmer till veges are soft, then puree. Add 1 can evaporated milk, or 200ml cream. Reheat but do not boil. Season with salt and pepper.
It was absolutely delicious.