@tsarstepan,
tsar
there is no such thing as a kosher reuben.
All ruebens are non-kosher.
even us fallen away Catholics know you can't have meat and dairy (cheese) together.
You can have a corn beef sandwich.
You can have corn beef and saurkraut.
Joe(the sandwichs at the 2nd Ave Deli on First Ave are too big to eat)Nation
and they ARE kosher so no cheese.