In a large skillet over medium heat, steam the corned beef in 1/4 cup water until warmed, about 4 minutes.
In a small bowl, mix the ketchup, mayonnaise and relish.
Arrange the bread slices on a baking sheet. Spread the dressing on the bread slices. Top the bread slices evenly with the corned beef, and top with a slice of Swiss cheese and a generous serving of sauerkraut.
Bake until the cheese is just melted, about 5 minutes.
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