pickles and potato chips or French fries(for serving)
Butter one side of each of the slices of rye bread. Spread Russian dressing on the unbuttered sides. Layer the sandwich in the following order: 1 slice of Swiss cheese, corned beef, sauerkraut, and the remaining slice of cheese. Top with the second slice of bread, dressing-side down.
Heat a nonstick skillet over medium heat. Grill the sandwich until the bread is golden and crispy and the cheese is melted, about 3 minutes per side. Gently press down on the sandwich occasionally with a spatula as it cooks. Serve immediately with pickles and potato chips, French fries, or vinaigrette potato salad.