It's chile season and Severo obtained some Hatch, NM chiles @ work. Here is my technique for grilling and preserving them, learned from a neighbor in Pasadena (who had family in Hatch).
I use the gas grill (no chile roaster available). Grill until nicely charred - but not burnt:
then place serving size (I do 4) in a plastic bag (I use folding sandwich bags)
you don't need to peel off skin until ready to use!
then put bags into a gallon sized zip lock and store in the freezer...