Experiment performed on December 9th, 2013.
(Inspired from this recipe.)
For 6 small jars:
Chop rougly tomatillos and apples. Chop thinely the chilies. Mix everything in a large pan, bring to boil, and let simmer for more or less on hour, until it ends up with the consistency of a jam.
Sterilize jars by pouring boiling water on them, and fill them with chutney. Small jars are preferable, to finish them quickier once open and avoid them to get moldy.