Hot take: If you need a knife and fork to eat it, it isn't a sandwich.
While some kind of bready substance is required before you can call it a sandwich, just slapping on some bread isn't enough. You have to be able to eat it with your hands.
Therefore burritos, pastys and piroshkis are all sandwiches. Whereas a fancy hamburger that would dump all twenty ingredients out of the bun and into your lap if you picked it up is not.
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