Square tart pans?
I've been looking through Eric Kayser's book on tarts and note that he makes most tarts in a 91/2 inch square non-fluted tart pan. He doesn't address the pans at all in his book but I assume that this must be a square pan with a removable bottom - as in a round fluted tart pan. Are such pans available?
Yes. Sur La Table has them in different sizes.
William Sonoma has a rectangle.
Probably most restaurant supply or online sources would have them.