What pseudocereal was a former staple of the Aztec empire ?
Additional books in the series ( " Aztec Blood " , 2002 ; " Aztec Rage " , 2006 ; " Aztec Fire " , 2008 , " Aztec Revenge " , 2012 ) were written by Robert Gleason , Jennings ' former editor , and Junius Podrug , working from notes left by Jennings .