1. Remove tough core from base of cauliflower and break head into florets. Place in a microwaveable casserole. Add a couple of tablespoons of water, and cover with the casserole’s lid or another microwave-safe cover.
2. Cook on High for 10 to 12 minutes, or until quite tender but not yet sulfury smelling. (The cauliflower may also be steamed or boiled.).
3. Drain it thoroughly. Puree in blender or food processor.
4. Add butter and season to taste salt and pepper.