Where the Reuben Sandwich comes from is up for debate. It is, however, one of America's most popular sandwiches, as it's served in restaurants from the Southwest to Northeast. Main ingredients include corned beef, Swiss cheese and sauerkraut served on rye bread with Russian dressing. Some recipes call for coleslaw instead of sauerkraut. If you prefer to make your own Russian dressing, you'll need mayonnaise, ketchup, minced onions or chives, horseradish, lemon juice, paprika and parsley or dill and salt and pepper. If you don't have an indoor grill, like the one used for this recipe, you can use a skillet over the stove to toast the bread and warm the sandwich through.