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Separate the rolls in halves and place the bottom pieces into a non-stick 13×9 baking dish. Layer about half the sliced ham on the rolls. Next layer the Swiss cheese over the ham and top with remaining ham slices and then add tops of rolls.
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In a small bowl add butter, mustard, Poppyseeds, onion and Worcestershire sauce. Stir to blend.
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Pour the mustard mixture evenly over the rolls. Bake at 350° for 20 minutes or until cheese is melted.
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Remove from oven and enjoy!