a delicacy (food) that has too much salt (see Molina)
Alonso de Molina:
iztayoa. (pret. oiztayoac.) tener demasiada sal el manjar. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 49r. col. 2. Thanks to Joe Campbell for providing the transcription.