Follow these steps and you shouldnt run into any problems at all...
The tin foil is on the jar to keep outside moisture from entering the jar during process.
Make sure your jars top has a filtered hole or has the top barely on it and tighten at the end if soo!!!
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PS. A vacuum chamber can be used in place of a pressure cooker simply vacuum the chamber to 15psi then boil water in a pot with the vac chamber in the boiling water same process witb water except it only take about 90 min 1 and a half hours!!!!!!..... ( educational video used for edible food to sustain nature ) ( music by the talented under looked cal scrubby - song name is anxiety )
![](https://i.ytimg.com/vi/enc48Cpfulw/maxresdefault.jpg)