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In a 9x13 baking pan, place the bottoms of each of the rolls down.
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Layer one-fourth slice cheese, 2 slices of ham, followed by another one-fourth slice cheese on each of the rolls. Place the tops of the rolls on the cheese.
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Mix together melted butter, mustard, worcestershire sauce, and minced onion until well combined.
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Spoon the mixture evenly over the tops of each of the sandwiches.
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Cover with foil and refrigerate overnight (at least 6-8 hours is ideal, but they will still turn out fine if baked immediately).
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Preheat oven to 350 degrees, remove foil from pan, and baked for 15-20 minutes.
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The tops should have a nice crunch on them. Serve.