INGREDIENTS
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1/4 cup mayonnaise
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1/4 cup spicy mustard
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3 to 4 tablespoons poppy seeds
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3 tablespoons grated onion
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1 tablespoon horseradish mayonnaise
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Dash of Worcestershire
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12 soft hamburger buns, sliced in half
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1 pound thinly shaved roast beef
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8 ounces sliced provolone
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8 ounces American cheese