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Finely slice your onions and cook until tender in a heated oiled skillet for about 7 minutes.
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Add your stout and allow to simmer and evaporate.
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Spread some mayonnaise and mustard on the rye slices.
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Place ¼ of the beef, ¼ of the sauerkraut, and some grilled onions on one slice.
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Place the slice of cheese over all the ingredients and close the sandwich with the other slice.
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Grill the sandwiches (like you would a grilled cheese sandwich) for about 3 minutes in a well-greased hot pan.
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Sit back and enjoy with the rest of the bottle of stout!!