quince conserves or the flesh of the fruit (see Molina) (partly a loanword from Spanish, membrillo, quince)
Alonso de Molina:
necutlanelolli membrillo. conserua, o carne de membrillo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 65v. col. 1. Thanks to Joe Campbell for providing the transcription.