Diner owners who put “Rueben sandwiches” on their menus may rue the day they did so when they encounter a customer who cares about the correct spelling of this classic American concoction of corned beef, sauerkraut, Swiss cheese and Russian dressing on rye bread. Although the origin of the sandwich is obscure, being credited to several different restaurateurs, all of them spelled their name “Reuben,” with the E before the U.
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