Baked Ham and Swiss Sandwiches

1 stick of butter
1 onion, finely chopped
2 T. dijon mustard
2 t. Worcestershire sauce
3 t. poppy seeds
1/2 lb. shaved ham
8 slices of swiss cheese
1 pkg. (12 count) Hawaiian Sweet Rolls

Melt butter in medium skillet.  Saute onion until tender.  Stir in mustard, worcestershire, and poppy seeds. Simmer for about 5 minutes.  Keep the rolls in one big section, like they're packaged, but take a large, serrated knife and cut the tops off (keep them together).  Put the bottom half into a 13 x 9 pan.  Spread about 3/4 of the onion mixture onto the bottom half of the rolls.  Layer on the ham and swiss.  Place tops of bread back on top and then spread the remaining onion mixture over top.  Cover tightly with foil.  At this point, you can refrigerate them until you are ready to bake.  Bake at 350 for 30 minutes.  Remove foil and cut into individual sandwiches.

These are really yummy!  I made these the other night and everyone loved them.  I served them with a nice broccoli salad and some chips.  Easy and delicious!