1 1/2 sticks melted butter
3 tsp. poppy seeds
2 tsp. mustard
1 1/2 tsp. Worcestershire
1 onion, chopped very fine
6 oz. shredded Swiss cheese
6 oz. ham, chopped
3 pkgs. dinner rolls, split

Combine first 5 ingredients and spread on split rolls. Top with ham and cheese. Put top on rolls and bake at 350 degrees for 15 minutes.