Creating is a holiday tradition. They were prepared by our mothers, grandmothers, and now many of us also process our own preserves, which are supposed to make our autumn and winter time more pleasant. Usually during such activities, hot jars with contents are turned upside down to seal them. It turns out that the trick of our grandmothers has a scientific justification. Why should you do this?
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Do you have to turn the jars upside down? The trick used by grandmothers has a scientific justification
If we want to close soup, compote or various hot preserves in jars, we can use preserving. This is a method that our mothers and grandmothers have used for years to keep food fresh for up to several weeks, if we keep the jars in a cool place. Typically, we pour the hot content into the jar, screw it on tightly, and then turn it upside down. But why is it worth doing that? Professor Kasia, i.e. Katarzyna Siuzdak, suggests that this is scientifically justified.
When we preserve food and turn the jars upside down, the air under the lid passes through its entire contents, heating the jar. The hot gas has nowhere to go, so it cools down along with the food being cooked. The pressure outside the jar presses on the cap, making it concave and better protecting the contents. However, if we want our preserves to last much longer, it is worth pasteurizing. Do you have to turn the jars upside down then?
Canning and pasteurization? Do you always have to turn the jars?
During pasteurization, we destroy vegetative forms of microorganisms, and thus extend the shelf life of preserves. If you have previously sealed the jars, there is no need to turn them over again after pasteurization. However, when we skipped this step and immediately went to pasteurize the jars, after removing them from hot water or the oven, it is worth turning them upside down. Thanks to this, we will be sure that the content has been carefully secured. In the comments section under Professor Kasia’s material, many words were left about the scientific explanation of the whole process. Some admitted that they turned the jars over, although they did not know exactly how this affected the preserving of the food.
And finally everything became clear!
My mother and grandmother have always bottled soups or excess dinner or bigos. And involuntarily I do it myself, hot food in a jar, jar upside down and then into the fridge. A spare lunch is always at hand.
Just yesterday my husband said why I turn these jars over, and I took it from the family home. Now I’ll show him why.
Source: Gazeta
Bruce is a talented author and journalist with a passion for entertainment . He currently works as a writer at the 247 News Agency, where he has established himself as a respected voice in the industry.
