The canned food aisle isn’t the most glamorous in the supermarket, but it encompasses the widest range of ingredients. In a time of budget eating and food banks, certain products beat their fresh equivalents in terms of cost, convenience and longevity. What’s more, metal cans can be recycled again and again. We're not suggesting you forego the fresh veg but everything has its place. We dug around our storecupboards to find the tinned treats we wouldn't be without.