Hot Ham and Cheese Sandwiches

1/4 C. butter
2 T. mustard
2 T. chopped onion
1/2 T. Worcestershire sauce
1 t. poppy seeds
8 slices deli thin ham
8 slices Swiss cheese
8 dinner rolls or buns

Soften butter and mix well with mustard, onion, Worcestershire sauce and poppy seeds.  Cut rolls in half and spread mixture on both sides of rolls.  Place ham and cheese in roll.  Wrap each sandwich in foil and freeze.  To bake from frozen - bake at 350 degrees 30 min. or until hot.  To bake after thawed - bake at 350 degrees for 10 min. or until hot.