Heat closed contact grill 5 minutes.
Spread butter on one side of each bread slice. On unbuttered side of 1 bread slice, spread 1 tablespoon of the dressing. Top with 1/4 cup of the sauerkraut, 2 oz corned beef, 2 slices cheese and remaining bread slice, buttered side up. Repeat for remaining sandwiches.
When grill is heated, place sandwiches on grill. Close grill; grill 5 to 6 minutes or until cheese is melted and grill marks appear. Serve immediately.