So it is impossible to know what the "backbones" of the sandwich are until you eat it!

Anything can be done by Schrödinger. Any cake is Schrödinger’s cake. You don’t know what stuff is there or if it’s there. Any closed opaque container is Schrödinger’s container. Every book is a Schrödinger book until you read it. And finally, as Lord Bertrand Russell said, "How do you know that when you turn B, the tables behind Bashi's backs don't turn into kangaroos?"