1: Spread 2 tablespoons of butter on one side of each slice of rye bread.
2: Layer corned beef, sauerkraut, and Swiss cheese between the unbuttered sides of the rye bread.
3: In a bowl, mix the mayonnaise, diced onion, ketchup, pickle relish, vinegar, paprika, and salt to create the 1000 Island dressing.
4: Spread dressing on the insides of the sandwich.
5: Heat a skillet over medium heat and place the sandwich in the skillet, buttered side down.
6: Grill until golden brown, about 5 minutes, then flip and grill the other side until crispy and the cheese has melted.
