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Shred and reheat the corned beef brisket in a pan, to warm and slightly crisp.
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Butter the outsides' of the bread.
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Layer the sandwich in the frying pan/skillet, buttered side down, cheese, then the corned beef brisket, and spread mustard on the inside of the remaining buttered bread.
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Grill on each side to the desired doneness, about 2 minutes or so each side.
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Slice and serve.