The world’s first cheeseburger in a can is sold by Katadyn’s Trekking-Mahlzeiten, a subsidiary company that develops specialist ready-meals for the outdoor, expedition and extreme athlete markets.
Instructions say to simply throw the can into a water container over a fire, give it a minute or two, fish it out, open the lid, and eat. It has a shelf life of twelve months without refrigeration and is billed as the ideal fast food treat for the wilderness. This is probably the fifth best thing since canned bacon.