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SOLVED: This apparently is a baking dish. Thrift store find for my wife. But why is there a hole in the side? What is it?
(lemmy.dbzer0.com)
Oh, and it's LARGE. That's my range it's sitting on, and it covers about 2/3 of it.
So you can look in and see how the pie is cooking and if the center is done yet.
Except that the crust where the window is would bake completely differently from the parts of the crust that would be touching the stoneware.
This is the only answer that sort of makes sense so far. For a pie with a crust, it lets you see what the crust looks like below the filling line.
I'm not a baker. Just a guesser.