A sandwich is meat and/or vegetables and/or cheese, with optional condiments, between two slices of bread or two halves of a split roll. Right?
Well, maybe only if you are a structure and ingredient purist. Twitterer @mattatomic gives us the following RPG-character-alignment style grid:
You may find yourself in more than one cell, but I think you'll probably be able to draw a left-right upward diagonal through your most rebellious position and be comfortable with everything above and to its left.
Which is my attempt at composing a rule that means, hot dogs are sandwiches but that ice cream thing to the right is clearly a cannoli, burritos are just burritos and are we seriously talking about Pop-Tarts in a sandwich conversation???