Let's take the time to define sandwiches as the constructive framework that they are. 

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Here is the hypothesis:

One thing between two things is a sandwich. 

The sandwiches that we will largely cover fall in the food category, though the world of layered composites is a wild and untamed vastness that extends far beyond the edible realm.

In order to prove this hypothesis, we must make it more testable. The problem that currently faces the sandwich empire is that people are constantly arguing about what is and isn't a sandwich. 

I propose a physical test to solve this debate once and for all.

If a sandwich is a structure that consists of a thing (Interior Core) placed between other things (Exterior Shell), then it would be possible to take an imaginary pin and push it through the layers in the following order.

1. Exterior Shell

2. Interior Core

3. Exterior Shell

If this act is possible, then it is clear that we are dealing with an object that meets the sandwich criteria. The second piece of criteria that should help define a sandwich for most people is the ability and intent to hold any part of the exterior shell with a hand. This is an objective that most people have when sandwiches were first invented and it stands true today. There may exist scenarios where a sandwich is created, and then added upon until it is no longer able to be held, notable examples include "challenge" burgers that are 5-10 layers tall, wet burritos that are covered in sauce, and beef wellington. These are still to be considered sandwiches. 

Sandwiches aren't that complicated. 


Just kidding, it is complicated. Here is a list of items that are, followed by a list of items that are not sandwiches. 

List of Edge Cases that are sandwiches

  • Folded Taco
  • Burrito
  • Calzone
  • A dinner roll that you have stuffed things inside
  • Pork Bun
  • Corn Dog
  • Hot Dog (a bun of some sort is required)
  • Pigs in a blanket
  • Two pieces of Pizza, one on top of the other, with the ingredients sides touching. 
  • Sushi Hand Roll
  • Twinkie
  • Kit Kat
  • Beef Wellington
  • Sloppy Joe
  • Double Down
  • Chicken Lettuce Wraps
  • Sandwich Wraps
  • Quesadilla
  • Wowshi
  • Falafel or Doner kebab Pita

List of Edge Cases that are NOT sandwiches

  • Pierogi
  • Sushi Rolls (Excluding Hand Rolls)
  • Ravioli
  • Truffle
  • Open Faced Sandwiches
  • Single Pizza Slice, served flat
  • French Onion Soup served in a bread bowl
  • Snickers
  • Chicken Fried Steak
  • Unfolded Taco
  • Food served on a Trencher

Undecided

  • Tamales
  • Pizza Hut Stuffed Crust