The gastroabomination shown above is called "Molded Shrimp Salad". According to the directions in the February 1969 issue of McCall's, this regrettable dish is made by blending up gelatin, yogurt, mayonnaise and shrimp.... gag, choke! Fashioning it into the shape of a transmission gear doesn't help either.
Here's a couple more images of awful looking food. Check out the Flickr group "Gee that food looks terrible!" for over a thousand more.
As a commentor on Flickr asked: "What washed up on shore to die?"
Ham and cat vomit wrapped around a celery stalk... delish!