Nuts & Rancidity
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Tech Help, Tips, Tricks, Techniques
There's nothing you can do to stop oxidative rancidity in nutmeats, other than defatting them. Period.
There are lots of things you can do to slow it down. Generally speaking, if you put a barrier around the nuts that can block oxygen, that helps (ie candying provides a sugar barrier). The lower temperatures you can expose the nuts to, the better (ie roast lower for longer vs very hot for shorter).
A couple of things to note:
Chocolate is a terrible oxygen barrier.
Sugar barriers, if intact, are great. However it's quite challenging to keep sugar from getting cracks in it, which lets the oxygen through.
You will never. Ever. get 1 year stability in pecans, unless you keep them frozen. Or perhaps stored in space where there is no oxygen.