If you are a regular here, you might be aware that I have a bit of a thing for tins of fish, and I felt it was time we took a moment to explore this most excellent foodstuff. The tin of fish is a divisive snack option. I remember tucking into a tin once when working at a school and being asked if I was eating cat food (erm, noooo). I also recall bonding with my fellow students while studying for my Personal Trainer qualifications : "TIN OF FISH, Awesome snack!". Then I knew I had found my people. What is a tin of fish? There are all kinds of variants on a tin of fish, it might be round or square, it might contain tuna, sardines, mackerel or salmon. It might be in sauce, or not. The only prerequisite is that it is oily fish, preserved in a tinned format. That said, when I use the term, I will be referring to mackerel in plain tomato sauce (not spicy, because some brand's idea of what makes a "spicy tomato sauce" leaves much to be desired) in a flat tin