The Cube Rule of Food Identification (2017)
I'm a sandwich descriptivist rather than a prescriptivist.   
I know what a sandwich is, and any definition that say that a hot dog is a sandwich or that a sub/hero/hoagie is not a sandwich is a definition that I do not accept.Similarly, a bagel with cream cheese (that is, both halves of the bagel sandwiching cream cheese) is not a sandwich (despite the use of the word "sandwiching" in the definition), but a bagel with turkey inside is a sandwich.I'm comfortable without a definition, though I look forward to hearing the reports of the intrepid theoreticians that can yield definitions that satisfy these criteria, much as I laud the efforts of the adjective-ordering folk in descriptive grammar.My rule of thumb is that if I went into a restaurant and asked the waiter "I want a sandwich, but I don't care what kind -- surprise me!" and they brought me an object, how angry would I be at the waiter who brought me that object.