Saw this rerun on America's Test Kitchen last night:

https://www.americastestkitchen.com/...iflower-gratin

<gasp> He uses a steamer basket to steam the cauliflower florets.

This looks really tasty and doesn't require any sort of heavy cream or a
mornay sauce. You make the sauce from the pureed <another gasp>
cauliflower stems.

I bought a head of cauliflower yesterday. I'm thinking I'll try this
rather than roasting the head of cauliflower.

Jill