As someone who is lactose intolerant and not a huge fan of cauliflower I was intrigued by the idea of making sauce out of it, I had seen a couple alfredo recipes that still used cream in them but I tried this recipe from the Detoxinista blog.
You saute onion and garlic, then add water and the cauliflower chopped up to oil until they are tender. I made sure to wash and soak my cauliflower as I did find a couple critters hiding in it and some dust, I had to be careful while cutting it to check for these as well.
Then you puree the contents of the pan water and all and add salt to taste. I added salt, pepper, and a couple basil leaves then reheated the puree in the same pan.