pressuring canning

Note: This is part of a two-part piece on the basics of canning (the whole thing in more refined form is contained in _Independence Days_ as well). In a previous post, I wrote about putting canning in perspective - it is not all of food preservation, nor is it essential. That said, however, I get more questions how how to can than all other forms of food preservation put together, so since my food storage class is doing Pressure Canning this week, I thought I'd re-run essays I've written about how to can. I should note, I ask that anyone who has never canned before (or not for decades -…