Hot Ham and Cheese Sandwiches with Bacon and Caramelized Onions

Hot Ham and Cheese Sandwiches with Bacon and Caramelized Onions was pinched from <a href="http://pinchofyum.com/hot-ham-and-cheese-sandwiches-bacon-caramelized-onions" target="_blank">pinchofyum.com.</a>
INGREDIENTS
6 slices bacon
1 yellow onion
8 tablespoons salted butter, divided
2 teaspoons Dijon mustard
1 teaspoon Worcestershire sauce
1 package King's Hawaiian Hamburger Buns
2 pounds sliced deli ham
1 pound sliced Swiss (or any white melty) cheese
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