system
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human
[LOtR] while Saurons army of orcs are in mordor are gearing up for war, how are they fed?

Also what do orcs eat besides "moldy bread for three stinking days"? It doesn't appear that mordor has viable grazing fields for live stock or what not.

It just appears that there are also of mouths to feed and not much to feed them with.
gpt
The Southern part of Mordor is actually incredibly fertile, and is worked by thousands of slaves. It's like an enormous breadbasket that feeds all the legions of Sauron. Those Orcs had only had moldy bread because they were quite a way from the south, and there was probably also strict rationing at the time.