Sauce ingredients:2 sticks butter3 tablespoons dried mustard1 teaspoon Worchestershire sauce1 tablespoon sesame seeds1 small grated onionThin slices of hamSliced swiss cheeseOnion Buns or your favorite bunMix melted butter with all sauce ingredients in pan. Spread mixture on onion buns. Stack thin slices of ham and a slice of swiss cheese on each bun. Wrap in foil. (You can freeze at this point.) Heat before serving. 400 degrees for ten minutes.