Now what if the pizza crust is toasted enough that, while it was not your intent, it breaks evenly at the seam during the act of folding it in half, and then you proceed to collapse the two halves before taking a bite. Did you have a sandwich for lunch?
Aha, I love a man of principle. I would say that I would have had a sandwich in that case, as I believe that the structure of the food item should only be considered as it enters your mouth, completely removed from an explanation as to how that food item came to be up to that point.
However, I wonder you you would reconcile an uncut, folded pizza not being a sandwich against a meatball marinara, which to my understanding is a single piece of sliced bread with meat and sauce in the middle. Is this not a sandwich?
If you gnaw off the fold, does the remaining part become a sandwich? If you bite off a piece that excludes the fold, does it become sandwich in the mouth? Fascinating mystery, right up there with the transubstration in that cannibal religion!
If you don’t cut it, no.
If you cut it at the fold, yes.
Now what if the pizza crust is toasted enough that, while it was not your intent, it breaks evenly at the seam during the act of folding it in half, and then you proceed to collapse the two halves before taking a bite. Did you have a sandwich for lunch?