Tomato-Banana Tarts
These two foods just do not belong together. While bananas are great on their own, and tomatoes are also great on their own, if you put them together you will get this gross looking combo.
Just because tomatoes are a fruit, does not mean that they should be put with other fruits. This is by no means a fruit salad. There are so many other ways that you can prepare a great tasting fruit salad that there is no reason you should be thinking of throwing some tomatoe chunks in the mix.
Savory Jello Products
Food that bounces on your plate does not sound all that appetizing, to begin with.
Even though plain jello is appropriate for situations where you simply cannot stomach any form of food, like when you have food poisoning, jello salad is just unacceptable and disgusting. As far as terrible food inventions go, jello salad is by far the worst and most likely why the 70s was the era of gross foods.