A Reuben is a popular sandwich that typically consists of layers of corned beef, Swiss cheese, sauerkraut, and Russian or Thousand Island dressing, all grilled between slices of rye bread. It is known for its hearty flavors and is often served hot, making it a favorite in delis and diners. The origins of the Reuben sandwich are debated, with some claiming it was created by a man named Reuben Kulakowski in the early 20th century. Others suggest it was invented in Nebraska or New York City. Regardless of its beginnings, the Reuben remains a classic American comfort food.