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Can't beat the All American pressure cooker. Not gasket to wear out.
Any old large pot will do for a no-pressure steam canner. Any of the Ball starter kits will do. You can usually pick those up at...

WiseOldOwl, I do the same thing. A couple hours for 2 or 3 weekends when the corn is at its peak. The canner and the lobster pot get filled for blanching, then everything goes outdoors to be 'zipped'...

I liked the mushy peas, had em with fish and chips somewhere in Cornwall, but couldn't help wondering how much better they'd be made with a touch of bacon grease. LOL.

Anything pre-frozen is going to get mushy and will lose flavor. There's nothing out there that says you can't can frozen veggies. You can can frozen meats so not sure what the issues might be with...