The question appears simple. However with many seemingly simple topics this question is deceptively complex if one gives the matter some thought. For what does it mean to be a sandwich? Who defines what a sandwich is? Do we invoke the authorities in this matter? If so then which ones? If we do not invoke the authorities then who do we invoke? Do we invoke the dictionary? If so then which one? Why would we invoke the dictionary? Do we go for the common man's definition of a sandwich? If so then what is that definition? Do we invoke the origin of the sandwich? The sandwich was invented when the Earl of Sandwich had a slice of roast beef between two slices of bread. Does a hotdog constitute a sandwich under that structure? There are many questions that could be asked here.