If you are new to canning, I would highly recommend the book "Putting Food By" ( https://www.amazon.com/dp/B0053YNF46/ ) or something like the Ball Blue Book ( https://www.amazon.com/dp/B005SK6Y1Q/ ). Recommendations for canning safety have changed greatly since our parents' and grandparents' time... as have the tomatoes (and other veggies) that we are growing and processing.
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion
