Poppy Seed Ham and Cheese Melts

1 1/2 lbs thinly sliced deli ham
1 lb cheddar cheese, sliced
1/2 cup butter
2 T prepared mustard
3 T poppy seeds
1 t Worcestershire sauce
8 hamburger buns

Cooking Day: Melt butter in a saucepan over low heat. Stir in mustard, poppy seeds, and Worcestershire sauce. To assemble sandwiches, layer ham, cheese and 1 T of sauce on bun. Wrap sandwiches in foil, then place in a freezer bag and freeze.

Serving Day: Remove desired number of sandwiches from freezer. Preheat oven to 350 degrees. Place foil wrapped sandwiches directly on oven rack and warm in oven until cheese is melted and sandwiches are warm, about 20 minutes.