Step 1: Prepare the Russian Dressing

1. Combine Ingredients: In a small bowl, mix mayonnaise, ketchup, horseradish, Worcestershire sauce, smoked paprika, Dijon mustard, and pickle relish.
2. Season to Taste: Add salt and black pepper, then stir until smooth and well combined.
3. Chill: Cover and refrigerate until ready to use. This can be made up to 3 days in advance.

Step 2: Assemble the Sandwiches

1. Spread the Dressing: Spread a generous layer of Russian dressing on one side of each slice of bread.
2. Layer the Ingredients:
   • Place a slice of Swiss cheese on four of the bread slices (dressing side up).
   • Add a layer of corned beef on top of the cheese.
   • Spread a layer of drained sauerkraut over the corned beef.
   • Top with another slice of Swiss cheese, then place the remaining bread slices on top, dressing side down.

Step 3: Grill the Sandwiches

1. Heat the Skillet: Preheat a large skillet or griddle over medium heat.
2. Butter the Bread: Spread softened butter evenly over the outer sides of each sandwich.
3. Cook: Place the sandwiches in the skillet and cook for 3-4 minutes per side, pressing gently with a spatula to encourage even browning and melting.
4. Check for Doneness: The bread should be golden brown, and the cheese should be fully melted. Adjust heat if necessary to avoid burning.

Step 4: Serve

1. Slice and Serve: Cut each sandwich in half and serve warm.
2. Optional Sides: Pair with dill pickles, potato chips, coleslaw, or a bowl of hot soup for a complete meal.