Around a week ago, I posted a photo on Facebook of a batch of blueberry-raspberry jam. The jars were upside down, because the instructions said that one should do that for five minutes after filling them. There followed a thread of questions about why the jars were upside down and comments from those who also do so and those who'd never heard of it. Just now, I looked up the issue and discovered this: it's an old-fashioned method that's meant to make the seal better, but it's been shown that it doesn't do so and even increases the likelihood that the jam will go bad. I won't do it next time! (Andrew Shields, #111words, 10 October)
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