A Reuben sandwich is a popular American deli sandwich made with layers of corned beef, Swiss cheese, sauerkraut, and Russian or Thousand Island dressing. It is typically grilled between slices of rye bread, which gives it a crispy texture and enhances the flavors of the ingredients. The origins of the Reuben sandwich are debated, with some claiming it was created in the early 20th century by a New York deli owner, while others attribute it to a Nebraska grocer. Regardless of its beginnings, the Reuben remains a beloved choice for many sandwich lovers across the United States.