Tuna Devil Eggs

1 1/2 doz. eggs, hard boiled

1 can tuna

Dash of salt

Dash of pepper

3 tbsp. salad dressing

2 tsp. mustard

Chopped onion to taste

 Boil eggs with a little salt.  Cut eggs in half and take out the yolks.  Mash yolks with a fork, adding salt, pepper, salad dressing, tuna, mustard and chopped onion.  Fill egg whites with the mixture.