Scorzonera is a new word to me, exactly what is it?

black salsify or oyster plant

Wished I had some right now. Most years I sow some, but with our dry weather last year I gave up when the water bill trippled.

How do you prepare scorzonera?

My mother used to prepare it exactly like scalloped potatoes, layers of peeled slices interspersed with a thin white sauce. I didn't find much similarity to oyster taste, but it was edible. Lookiing back, I don't remember that it had wintered, so that probably affected the flavor.