I just made a mock Ruben sandwich with no bread.
I just picked up some fresh deli Boars Head Corned Beef, thin sliced, 0g-carbs.

I Placed 2 slices on plate, side by side.
Big spoonful of sauerkraut in the center of the slice
Topped with 1/2 slice of Havarti cheese on each pile of cold slaw
Fold over each end onto the pile, like a little package.
microwaved 45 seconds to make the cheese melt
Dipping sauce of mayo with a small squirt of low-sugar catsup to make Russian Dressing for the Ruben taste.