Melt butter in microwave. Add chopped onion and microwave a bit to cook the onion. Stir in mustard.
Put bottom of rolls in microwave save dish. Put a heaping tablespoon of butter mixture on each bun. Add ham and swiss cheese. Put anothe tablespoon of butter mixture on each sandwich.
Microwave on minute. Put top of bun on each sandwich and microwave another minute. Brush the top of sandwiches if any mixture is left. (May need to microwave a little more.)
Originally Submitted
4/28/2013
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