Hamburger steaks are news to me... Not a thing in the part of Pennsylvania I live in, nor were they a thing in NYC, nor were they a thing in Austin... I presume they're a patty of ground meat served with a steak-y sauce and no bun. Or are they a pummeled-rather-than-ground meat thing that gets turned into a "Swiss Steak" round abouts where I live?
edit to add: The not ground but pummeled meat around here is sold as "cube steak"...