I use a little sour cream, whipping cream and a little onion/green onion and garlic (either cooked with the cauilflower in water or broth, or browned in oil or butter) and it makes such good fauxtatoes that my kids don't miss their regular mashed taters. I whir it in the blender until fairly smooth but you can always mash it with a potato masher/ricer.

If the cauliflower is too wet it will be runny so I drain it well, or even drain it and then put it back in the pan over low heat until it is quite dry before adding the other ingredients.

I served this at Christmas dinner with regular mashed potato casserole and this was the one people wanted the recipe for.