The "grape" in Grape-Nuts comes from having contained maltose, the "grape" type of this
.... Perhaps the most famous occurrence 
of maltose in a prepared food is Post's "Grape Nuts" cereal, which was... [DOC] [TLE] The Annotated MST - Time of the Apes [PAR] Grape-Nuts is a cereal first produced in 1897 by Post that contains wheat ...