Smoked meat and cheese on a bun

1/2 lb soft butter
3 tbsp prepared mustard
1 1/2tbsp poppy seeds
1 tsp worcestershire sauce
1 lrg onion grated
your favorite type of bun
2 lbs smoked meat thinly sliced
swiss cheese slices [or what kind you like]
Mix the first 5 ingrediants and spread on inside of sliced buns,place sliced meat and cheese on buns wrap in tin foil and place in 400 degree oven for 10 mins. enjoy [about 16 servings]