This is the forum for helping you out if you're stuck in Grimrock 2 or if you want to discuss about the mysteries of the Isle of Nex. Warning: forum contains spoilers!
The pie follows the same format as the earlier pyramid puzzles around making offerings.
SpoilerShow
Specifically, the note with the Mirror Gauntlets describes that they are a gift to the Glutton, who needed to be put in six coffins. So find the chamber like that. Fittingly for a glutton, the hidden treasure is all food and stuff, including the pie.
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Ahhhhhh, so obvious now. I thought that it was something to do with that chamber but I completed the Pyramid so long ago that I had forgotten about that note. Thanks.
Press button. go backward then left then forward climb ladder and on top of the ladder DONT GO FORWARD ~ go LEFT instead. Total easy to reach the last skull.