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Using an older (early) version of Tom's Adjustable Rig...*over the top of an Oval Stone*
It's the perfect set up for large baking dishes like this!
375' ish...55 to 65 mins.
(this pre-supposes your egg is well pre heated.)
Times and temps are also tuned to cooking this "up high" in the dome.
Placing the dish at a lower position in the egg will change things.
XL BGE and Pellet smoker