INGREDIENTS
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2 Tbs. mayonnaise
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1 Tbs. ketchup
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1 Tbs. dill relish (not sweet)
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1-1/3 cups sauerkraut, preferably bagged, not canned
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3/4 lb. thin-sliced corned beef
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4 large 3/4-inch-thick slices rye bread
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2 Tbs. unsalted butter, softened
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6 oz. Gruyère, thinly sliced