Ham Delights

1 1/2 sticks of butter
3 T yellow mustard
1 T Worcestershire sauce
1 med. onion, grated (I use frozen onions, a little softer after cooked)
3 T poppy seeds
1 lb. Swiss cheese, thin sliced
1 lb. shaved ham (deli or packaged works fine)
3 or 4 packages of rolls

Melt butter, add next 4 ingredients. Bring to a boil and cool. Slice rolls in half and spread sauce on both sides of the rolls. Top with ham & cheese. For the "sliders" I use 2 slices of ham and one slice of cheese, cut in 1/2. Put into freezer at this point in a 9x13 pan, covered w/ foil. When ready to serve, thaw and bake at 350 for 20 minutes.