Does a sandwich have to be made of bread? Would you call it a sandwich if it were between waffles or pancakes? Isn't a quesadilla simply a grilled cheese sandwich (and fixings) "sandwiched" between two tortilla shells?
A query about what makes a sandwich is posted on Serious Eats today, from a post that includes a picture of a potato-ham sandwich open faced sandwich on a waffle. I guess no one bothered to send a photo and review of the pancake-sausage sandwich at Jollibee recently.