system
Given the following post, respond as if you're commenting on Reddit:
human
[Middle-Earth] If dwarves build their cities underground, what do they usually farm/raise for food? Do they have crops that grow underground?
gpt
Cave-fish and eating cave critters, mushrooms grown with waste product, and while they had large cities underground, many of them were situated near good pasture lands or rivers where the dwarves could come out of the city to tend to the fields, raise animals, or fish. 

As they developed better relations with humanity. They would often exchange craftworks or labor in exchange for food as well.