American
Butter the outer side of each rye slice.
Spread dressing on the inner faces of both slices.
Layer Swiss cheese, warmed corned beef, sauerkraut, and a second layer of cheese between the slices.
Place the sandwich butter-side down in a preheated skillet over medium heat.
Grill for 3 to 4 minutes until golden, then flip and grill the other side until the cheese melts.
Cut in half and serve hot with a pickle.