Hot Ham Sandwich Recipe

Who can beat a hot sandwich in weather like this? My sister Alane called the other day and requested a recipe that is a hit with our entire family. A friend made these one time, they were soooo good I asked for the recipe, and then found out how easy they are to make, that they freeze, and are a hit every time I serve them. I try to keep them made up and in the freezer all the time, as they are really handy to have on hand for those cold evenings, and by the way, they go great with the Golden Onion Soup.

Ham Rolls
3 pkg. Hawaiian Rolls (I find these usually in the deli at Wal-mart, some stores they are in the bread isle)
1 lb. boiled ham (shredded)
1 lb. Swiss cheese slices

Sauce:
3 sticks of butter or margarine
2 med onion, finally chopped
6 T. Worcestershire Sauce
8 T Prepared mustard
A T or so of poppy seeds

Melt butter in sauce pan, add onion, Worcestershire sauce, mustard, and poppy seeds, heat thoroughly. Leave rolls intact, (partially frozen is best) and split in half across the entire set of rolls. Spread butter mixture on bread, layering ham and cheese, and wrap in heavy duty foil.
Heat for 15-20 min. (thaw thoroughly if frozen) at 350 degrees till hot and cheese melts.
YUMMMMM!