<Tr> <Th> Main ingredients </Th> <Td> Corned beef Sauerkraut Swiss cheese Rye bread Russian dressing . </Td> </Tr> <Tr> <Td_colspan="2"> Cookbook: Reuben sandwich Media: Reuben sandwich </Td> </Tr> <P> The Reuben sandwich is an American hot sandwich composed of corned beef, Swiss cheese, sauerkraut, and Russian dressing, grilled between slices of rye bread . Several variants exist . </P> <P> One origin story holds that Reuben Kulakofsky (his first name sometimes spelled Reubin; his last name sometimes shortened to Kay), a Jewish Lithuanian - born grocer residing in Omaha, Nebraska, was the inventor, perhaps as part of a group effort by members of Kulakofsky's weekly poker game held in the Blackstone Hotel from around 1920 through 1935 . The participants, who nicknamed themselves "the committee", included the hotel's owner, Charles Schimmel . The sandwich first gained local fame when Schimmel put it on the Blackstone's lunch menu, and its fame spread when a former employee of the hotel won a national contest with the recipe . In Omaha, March 14 was proclaimed as Reuben Sandwich Day . </P>

What is the meat in a reuben sandwich