These little pie tins are just that: small, really sturdy, commercial quality pie tins. There is a local sandwich shop/bakery which now sells pies, quiches, pot pies, etc out of the back of the store. They are stout enough for many many re-uses. And as you can see they will ring the vortex perfectly.
If I could find where to buy them I would. As it is now I have 10 or 12.