Definitely a grinder!
I think this is something that is common in the Northeast. We actually have a couple of sandwich places here in Columbus that have Grinder in their name and call them Grinders on their menu. I still think of them as a Sub.I’m the only weirdo!
Only one of those I've ever heard of is a sub, and since I loathe Subway I wouldn't think of calling it that. It just looks like a ham and salad roll to me.
I'm afraid so. I've never even heard of a grinder.I’m the only weirdo!