The Cuban Sliders

Need:

1 pkg (12oz) Hawaiian sweet rolls
3/4 lb ham (deli sliced or otherwise)
6 slices swiss cheese
1/4 cup butter, cubed
1 TBSP finely chopped onion
1 TBSP dijon mustard

Do:

Preheat over to 350 degrees
Cut the rolls horizontally without separating
Put bottom of rolls in greased 13x9 inch baking pan
Layer ham and cheese
Replace top halves of rolls
Melt butter; stir in onion and mustard
Drizzle butter mixture over roll tops
Bake covered w/ foil 10 minutes
Uncover and cook 5-10 minutes more
Cut into sliders