It's called "Blackstrap Molasses". Lyrics are by Jane Wyman, Jimmy Durante, Groucho Marx and Danny Kaye.
Blackstrap Molasses and the wheat germ bread/Makes you live so long you'll wish you were dead/Add some yogurt and you'll be well fed/ From eating blackstrap molasses and the wheat germ bread/My grandpa 's older than the old gray mare/he sits a rockin' in his old rockin' chair/but now he's got a smile that he can't lose, grandma sitting knitting baby shoes...
I have a copy of that silly song. So so much for rap!!