Beef Manhattan is a Midwestern American open-faced sandwich consisting of sliced roast beef served on white bread, often topped with another slice of bread, and then covered in brown gravy. It is usually served with mashed potatoes, which are also covered in gravy, either on top of the steak or on the side of the plate.
A variation on this dish is Turkey Manhattan, which substitutes turkey for the roast beef. The dish is named after Manhattan, but it is not known as such there; dishes like it are usually called "open-face sandwiches" in New York City.
The dish was first served in a restaurant under the name "Beef Manhattan" in a now-defunct Indianapolis deli in the late 1940s where it gained traction as a Hoosier staple. The dish was named by Naval Ordnance Plant, Indianapolis (NOPI) workers who were trained on a fabrication of the Norden bombsight in Manhattan during World War II. They enjoyed the open-faced sandwich they had in Manhattan and brought it back to their cafeteria as the "Beef Manhattan".