It’s called dry oven canning. The oven heats up the contents of the mason jar, so when I put the lids on and let them cool, the air inside comes to a lower pressure and we get a vacuum seal. Same notion as you see with jars of salsa, where the little circle on the lid pops up only once you crack the seal
i just want to know why it’s in the oven
It’s called dry oven canning. The oven heats up the contents of the mason jar, so when I put the lids on and let them cool, the air inside comes to a lower pressure and we get a vacuum seal. Same notion as you see with jars of salsa, where the little circle on the lid pops up only once you crack the seal