INGREDIENTS
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1 egg, lightly beaten
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1 2 1/2 ounce package very thinly sliced corned beef, chopped
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1/3 cup finely chopped cabbage
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1/4 cup soft rye bread crumbs (about 1/2 slice)
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1/2 teaspoon caraway seeds
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1/4 teaspoon salt
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1 pound lean ground beef
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1 large red onion, sliced
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4 kaiser rolls, split
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3 tablespoons horseradish mustard