cookbook
The cook book I made can be described as a network. Circle shapes represent ingredients, while rectangular ones are dishes. Each ingredient is connected to multiple dishes. I think something like this would be useful on a fridge, cause then you can see what dishes you can make with the ingredients you have. Of course, that would be a pretty big graph, so it would probably only work with simple dishes.
I thought this best represents how I think about food, or at least what goes through my head when I look into my empty fridge and try to decide what I can make.