I wrote "Die Frau isst einen Sandwich" and I got wrong for that. I thought that sandwich was as much a masculine noun as it is neuter? Or does this mean that in situations with nouns like this, neuter takes precedence over masculine?
Duolingo previously suggested "Der Sandwich" as an alternative, to another answer. This is where I got the impression that it could be both. I asked my German speaking boyfriend, he told me that the norm is usually Das, Ein Sandwich, meaning neuter.