Hawaiian Sweet Roll Ham Sandwiches - 1 pkg of 12 Hawaiian sweet rolls, 1 onion, diced, 1 stick butter, melted, 3 T. Dijon mustard, 2 t. Worcestershire sauce, 3 t. Poppy seeds, 1/2 pound shaved ham, 8 slices Swiss cheese. Foil line 9x13 pan. Assemble sandwiches. Cover with foil & refrigerate until ready to bake. Bake at 350 for 20 min.