These are easy to make and you will be obsessed.
Slice rolls in half to separate tops and bottoms. Spread mustard on the bottom rolls and arrange in two 9x9 baking dishes.
Tops each roll with two slices of ham. Then, cover ham with Swiss cheese slices.
Place top halves of rolls on sandwiches.
Combine the melted butter, Worcestershire sauce, mustard and poppy seeds in a small bowl. Stir well, then pour over the rolls.
Cover and refrigerate for at least four hours, overnight is even better.
When ready to bake, preheat the oven to 350 degrees.
Cover each dish with foil and bake for 20-25 minutes.
If making right away, reduce the sauce ingredients by half and instead of pouring over the rolls, brush onto the inside top half of each roll. Bake as directed.