This is from a book published in the UK in 1910:

.... a fellow names a new cereal after himself, and advertises it by
saying that something of the kind was once the chief food of the
American Indians, "one of the most stalwart races of men the world has
ever produced"; their women, he says, "ground it laboriously in hollowed
stones and cooked it in a rude manner," and yet, notwithstanding this
laborious grinding and rude cooking, the corn, "together with meat taken
in the chase, sustained a race of muscular giants."

Does anyone know what he is talking about? I am pretty sure it would
have been commonplace in the USA and the UK 100 yrs ago, the cereal
advertised as Indian food, but I haven't been able to track it down and
nail the reference.

Tim W