Hot Ham And Cheese Sandwiches
["3/4 lb. butter or oleo", "3 Tbsp. mustard", "1 large onion", "2 Tbsp. poppy seed (optional)", "1 lb. chipped ham", "1 lb. Swiss cheese, sliced"]
["Mix first 4 ingredients; spread on buns.", "Add ham and one slice cheese.", "Wrap each in foil.", "Put in a 350\u00b0 oven for 15 minutes."]
["butter", "mustard", "onion", "ham", "Swiss cheese"]