I don't can, however they always canned at my grandparents growing up so I'm somewhat familiar :)
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1) I don't have the equipment. It seems to require a fairly large outlay of cash, and you also need room to store the equipment. (I don't even own a pressure cooker.)
I don't think that's true unless you're doing pressure canning or whatever (which you need to do for extremely low acid things like green beans - then you need a pressure canner). But for ordinary canning all you need is canning jars obviously - the Ball jars and the like. Which you may get free if you already buy jam etc. especially from the farmer's market and the like - these can be reused indefinitely or until they break. I already have a small collection started this way. And jar tops and sealant which I think you do need to buy new each time. A very large pot to boil it all in which you may already have and something to keep the jars in place when boiling. Ok if you are making jam you may need pectin.
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2) Jars: apparently you need to buy new lids and seals every season? Do you re-use the jars?
yes reuse the jars buy new lids and seals I think
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3) Quality: I occasionally get gifts of food that have been canned - runny preserves, suspiciously odd tasting tomatoes.
yea the suspicious tasting stuff you really shouldn't be eating. Canning should produce tasty food.
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4) Safety: Botulism is pretty rare, but the cases of it that do occur (in adults) are almost always in home canned food.
yea botulism is scary, but I think the risk is quite low. Don't eat anything that looks suspicious (bulging lids etc.),and follow the recipes for canning, you can't vary the recipes, as the acid content might get too low. But it is true just a small amout of botulism will kill, it's one of the most deadly toxins in existence.
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I feel like canning is one of those things I should do, but I'm not sure I'd actually end up saving money or eating better.
Yea something I should do. I mostly only want to do tomatoes and tomato products (which are pretty expensive in glass jars like I buy them). Fruit and stuff takes a lot of sugar to preserve it, which is tasty ocassionally, as a treat in the dead of winter, but maybe not best to be eating all the time.
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I would love to make my own strawberry jam but we've had little luck in growing strawberries.
There's also a concept of quick jams or temporary jams that doesn't involve canning. You make jam (if you ever get good strawberries etc.). And you FREEZE it and keep what you are using quickly in your fridge and the rest in the freezer. It will last about 6 months in the freezer supposedly if you do this. So if you really want homemade jam, eat it often and don't want to can, it's the way to go. Books like better homes and gardens cookbook have recipes for this type of jam (in addition to real canning stuff).
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i also grow quite a bit of basil and freeze pesto - I don't know if that can even be canned?
anything can be canned but if it doesn't have enough acid, you'd need to pressure can it.