The original song - Tuna the food of my soul - is based on 'Whispering Hope,' a famous old song.

Soft as the voice of my mother
Calling when night shadows fell
Calling her children to supper
Oh what a glorious smell

There on the dining room table
Served from a steaming glass bowl
Eaten with Jell-O and Kool-Aid
Tuna, the food of my soul/

Tuna casserole, oh how dear to my lips
Noodles and tuna and cream of mushroom and potato chips.

Only a small can of tuna,
Mushroom soup, celery and peas,
Mixed with a quart of egg noodles,
Sprinkled with chips and with cheese (Velveeta cheese)

When my eartlhy journey is over
Gladly I'll take to the air
Afterwards, in the church basement
They'll serve tuna casserole there (Lord willing)

Tuna casserole, oh how dear to my lips
Noodles and tuna and cream of mushroom and potato chips.