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When did canning and preserving ever go out of fashion? Maybe I'm a freak because I grew up on a property with apple, pear, plum and pie cherry trees, strawberries, blackberries and raspberries. We would get boxes of peaches to can, pick up walnuts and hazelnuts to shell and dry.
One day my mom asked me to go get a flat of berries and make jam. So I did. When she came home she was angry because a) I didn't use local berries and b) I made regular cooked jam and put it in jars instead of making her beloved freezer jam. Whatever.
My point is that to many of us with similar backgrounds canning and preserving is nothing new and for people to characterize this as a new fad seems rather amusing.
BTW I have a copy of Harrod's Book of Jams, Jellies and Chutneys that frankly makes for some interesting reading. Nicely photographed as well but alas, now apparently OP.