Ingredients:

2 cans tuna in spring water, drained
1/2 cup diced celery
1/2 cup diced onion
margarine
1 - 2 Tblsp Mayonaise
8 - 10 hamburger buns

Preheat oven to 350°F. Mix together the tuna, celery, onion and mayonaise. Use only enough mayonaise to bind other ingredients together, do not let it get soupy. Spread margarine on both inside surfaces of the hamburger buns then place 2 Tblsp of the mixture on each bun. Wrap the filled buns in aluminum foil. Bake in the oven for 15 minutes. Serve hot.