Interesting article that addresses one of the issues about ‘cooking in cans’:
It used to be a thing that you could cook heat your canned food, say, some Chef Boyardee for example, by putting the can in boiling water. When the food was heated all the way through you could open the can and eat. No muss, no fuss.
The change in this practice started a while back when cans were starting to incorporate plastic liners in them to help keep the cans from rusting and avoid flavor issues from the contents of the can reacting with metal….you can see this most notably in high-acid foods like tomatoes and pineapple which will eventually react with the can in a way that leaves a black ‘mold’ in the can.
This article seems to suggest that if there is an issue with the cans used these days, the negative impact is as minimal as the risk you get from microwaving your food in a plastic container.
I suppose that in a crisis, two or three days of canned ravioli heated in boiling water will do you far less damage than not eating at all, but I think I’m still inclined to just have a quality mess kit and a way to clean it. I am curious, however, about retort pouches. Obviously MRE’s are designed from the ground up to be heated in boiling water. But what about things like pouches of tuna and chicken from the supermarket? Just as boilable as MRE’s? Or are we back to worrying about plastic liners becoming part of our GI tract?
On the other hand, most foods that are canned are already cooked and simply need to be re-heated to be tasty. That doesn’t mean they can’t be eaten cold…just means they won’t be as enjoyable. And ‘not enjoyable’ beats starvation any day of the week.