>A sandwich is any food that uses a carbohydrate to protect your hands from a messier food, so that you can eat it at a card table without getting your hands dirty (a la the origin myth).
I mean legally speaking it requires bread not just a carbohydrate https://en.wikipedia.org/wiki/Sandwich#Language
>In the US, a court in Boston, Massachusetts, ruled in 2006 that a sandwich includes at least two slices of bread[1] and "under this definition, this court finds that the term 'sandwich' is not commonly understood to include burritos, tacos, and quesadillas,