Fried cat vomit.
Are you kidding? My cats never hork up anything that disgusting. At first I thought that the purple was some kind of over-boiled purple cabbage but after a second look it looks more like spoiled mystery meat.
The worst food I remember was as a young Marine at a joint service school on Ft Benjamin Harrison IN. The army cooks I believe were part of Project 100,000. Even their food looked better although it rarely tasted very good.