1 1/2 lbs. deli ham
3/4 lb. Swiss cheese
1 med. onion, quartered
2 sticks butter, softened
3 tbsp. prepared mustard
1 tsp. Worcestershire sauce
1 1/2 tbsp. poppy seed
3 pkgs. party rolls

Process onion, mustard, and Worcestershire in a food processor. Split the whole package of rolls as one roll and spread both sides with onion mixture. Put ham and cheese on rolls evenly. Put rolls together in original container.

Mix butter and poppy seeds and spread on top of rolls. Cut out individual rolls. Preheat oven to 375 degrees and heat for 15-20 minutes. Serve hot.