So, I'm running a campaign which takes place mostly underground, and the PCs are spending a lot of time with Dwarves who have never traded with the surface.
So what do Dwarves eat without access to the surface? Clearly they survived on Golarion for some time without access. An obvious one is mushroom dishes, and the occasional game meat like displacer beast, but for any large settlement, there would likely have to be some kind of semi-farmed animal.
My current fix is the invention of the 'deep goat', a variant underground goat with a black hide and darkvision. My argument to the players is that deep goats are clearly only omitted from the bestiaries due to space restrictions.
I could use some other suggestions as to what other foods underground races might eat, otherwise I'll have to go with displacer chickens, dark pigs, etc.