Kayelle
Chef Extraordinaire
I was thinking that it resembles a pizza pan to me.
In fact I had that same thought
(though I don't allow DH anywhere something sharp,
he's been known to lose digits and I'm not kidding here)
of taking a cheap-o-dollar-store pizza pan to experiment with.
Brilliant! A pizza pan would work! My pie pan was too small for a large pot of water.