The steamed cheeseburger does the one thing a burger is supposed to refuse: it never touches a hot surface. Ground beef is packed into a small metal tray and slid into a cabinet of trapped steam, where it cooks through with no sear, no crust, and no Maillard browning at all. A second tray of sharp cheddar goes in beside it and collapses into a thick, near-pourable molten state that no griddle could produce without splitting. When both are ready the cheese is scraped out and draped over the patty on a soft roll, and the result is a hamburger that has been built entirely around the absence of the crust everyone else is chasing.
The craft is in accepting what steam gives you and designing for it. The patty stays loose, gray, and gravy-soft because there is no seared shell holding it together, so the roll matters more than usual: a plain, sturdy hard roll or kaiser is chosen because it has to absorb the juice that a crustless patty sheds freely and still survive being lifted. The cheddar is the structural and flavor center here, not a finishing touch. Steaming drives it past the point where it would break on a flat-top, so it pools into the patty and the bread and binds a sandwich that has nothing crisp anywhere in it. The whole thing is monochrome and tender on purpose, and it reads as rich rather than heavy because the steam renders fat without concentrating it. A counter running these works the cabinet in a slow rotation, trays of meat and trays of cheese cycling through the vapor all afternoon, every burger soft, hot, and identical.
The variations stay inside the steam box. The cheese can be doubled into a heavier flood, and the standard dressing is raw onion and mustard, sometimes a slice of tomato, applied as the only cool and sharp counter to an otherwise uniformly soft sandwich. Some builds add steamed peppers from a third tray. These are small moves on a deliberately narrow form, and the broader regional burger argument, the smashed crust, the onion-fried patty, the cheese sealed inside the meat, are doing the opposite of what this one does and deserve their own articles rather than being crowded in here.