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PdfHeat and mix until blended: margarine or butter, mustard, finely chopped onion or dried minced onion, and poppy seeds.
Spread mustard mixture on both cut sides of buns.
Put ham and cheese on each bun and wrap in foil.
Bake 20 minutes in preheated 350° oven or until buns are toasted and cheese is melted.
If you’re pressed for time, just remove the foil wrapper and microwave for about 1 minute, or until cheese is completely melted.
Romano Buns freeze well, but add 10-15 minutes to baking time if putting them into the oven frozen.