The idea that we should classify food by shape is clearly erroneous. Our food classifications should be based on method of eating , not by shape! A sandwich is any food that uses a carbohydrate to protect your hands from a messier food, so that you can eat it at a card table without getting your hands dirty (a la the origin myth). Let's go through the things here: Pizza: Yes Sushi: Mostly no (the carbs don't protect…
NZ/Aussie Pies: Yes
These are pies you normally eat by hand. Unlike UK and rest of world pies, they have a strong base and sides so you can hold them easily while eating.