In the early '70s, there was a product on the market called "Hamburger
II" which I believe was raw ground beef extended in some way
(soybeans? horsemeat?). The only proof I have of its existence are my
own memories and the title sequence of the "Mary Tyler Moore Show" (a
poster advertising it is on the wall behind Mary in the supermarket).
If anyone has any info about this, please let me know.