Use leftovers to create a substantial sandwich. Together with surplus sliced beef, some Swiss cheese, and a smear of Russian dressing on rye, it can be griddled into melting deliciousness to create this Reuben sandwich.
Toss cabbage with cider vinegar and salt. Combine mayonnaise and chili sauce to make Russian dressing. Spread butter on outsides of bread. Spread Russian dressing on insides, and top each with cheese. Sandwich with sliced uncorned beef and some cabbage. Heat on a griddle over medium-high heat until cheese melts, about 3 minutes per side.