I've found it works best with fresh cauliflower and not frozen and the fresher the better. I found a head once in the back of my fridge and cut off all the brown spots and tried it mashed it was really not good.
I steamed mine in the microwave then mashed it. I liked it with some salt and pepper and a little smart balance. If you don't add some extra seasonings to it, it does taste like cauliflower.
Sarah in MD
49 years old, 5' highest weight-199lbs
. Started SBD Jan 2004, lost 47 pounds in 6 months, then slowly gained it all back.