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Export 8 ingredients for grocery delivery
Step 1
Preheat oven to 325 F.
Step 2
Slice your rolls in half horizontally.
Step 3
In a small saucepan, melt the butter.
Step 4
Whisk in the onion, mustard, poppy seeds, and Worcestershire sauce.
Step 5
Brush the butter mixture evenly over both the top (outside) and bottom half of the rolls.
Step 6
Layer the ham and Swiss slices over the bottom half of the rolls.
Step 7
Replace the top half of the rolls, and cover with foil.
Step 8
Bake for about 15-20 minutes, or until cheese is melted.
Step 9
Remove from oven, and serve warm.