The great debate.

[Super_Boom]

1.) I'd say no, since I assume toppings are supplemental and not a core part of the dish. It'd be like asking if the sauce is a topping.

2.) I guess, though it would be a different definition of sandwich than I'm used to.

3.) Maybe, same as 2. I dunno if soup even has an exact definition, and Wikipedia makes it sound pretty flexible. Your reality is whatever you want it to be I guess.