The Colorado burger topped with green chile and associated with Pueblo is the slopper.
A slopper is an open-faced hamburger covered with green chile, cheese, and other toppings. It is traditionally eaten with a knife and fork because the chile sauce makes the sandwich much wetter than an ordinary handheld burger.
The dish is strongly linked with Pueblo, Colorado, where several restaurants have claimed a role in its development. Its exact origin is debated, but local versions became prominent in the mid-20th century.
A slopper is not simply a burger with a small spoonful of chile. The defining presentation is a burger heavily smothered in chile, often with onions and cheese. Green chile itself is central to southern Colorado food culture and is also used in stews, enchiladas, and other regional dishes.