When I was searching for images of crackers I saw some that fit this description, like they'd been rolled out. You may have to examine the recipes and look at the pictures and work out a recipe for yourself. I've done that a few times, when I couldn't find exactly the right recipe, I found a good starting place and started experimenting.

I suppose you've tried tracking down Curmudgeon's cousin and asking him/her where they came from?

SRS