Dear Malcolm and Valerie,
Fresh walnuts kernels can be put in the freezer immediately. I crack & weigh 200 grams at a time and wrap in plastic film. I find this a useful quantity for cakes and salads. Fresh kernels also keep if immersed in honey -nice on dry cake ice cream & no refrigeration necessary. You can also make and refrigerate pesto using fresh kernels in lieu of pine nuts. However, if you keep the the whole nuts until the New Year they will have dried out more and so keep better when out of shell. I am still using last year’s with a crop with success.
Love, S
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