Ask the guy who just ate some 20-year-old canned vegetables

All men have their inner Icarus. Some men court death on far mountaintops. Some plumb the ocean’s depths. Me? I eat old vegetables. Really old vegetables. 20-year-old vegetables.

About five years ago, an aunt of mine passed away, and I inherited some of her worldly goods. Among them: many years’ worth of home-canned veggies, all neatly lined, row upon row, on basement shelves.

The vegetables looked good. I have been eating some of the more recent cannings regularly for the past five years, with no problems. They have been delicious!

But still sitting there, taunting me with their bright, just-canned colors, were the oldest offerings. Squash, okra, and green beans, languishing on the highest shelf. The canning date, neatly inscribed by my aunt with a black felt pen: 1990.

Ah, 1990! What times those were! George Bush the elder in the White House. Dana Carvey making fun of him on SNL. Across the pond, the Iron Lady Margaret Thatcher had just stepped down. Nobody outside Arkansas had much heard of Bill Clinton, and Dubya was just the President’s redneck playboy son. The internet had not yet addled the brains of the average citizen, and we got our Straight Dope on honest paper, as God intended. Roseanne Barr was the queen of television, but people were just starting to get hip to this weird Seinfeld show. Nobody outside Seattle knew what the hell “grunge” was.

As my aunt packed away the last of the summer’s veggies, that naughty Saddam Hussein was just launching his troops across the border into Kuwait.

Well, this thread reminded me of my ancient veggies, now perched on a top shelf in my own pantry. I’d never had the heart to throw them out nor the courage to eat them. So today I pulled some of them down. Still looking good. Bright yellows and greens. Checked the tops of the cans. A few spots of rust, but not rusted through. The seal held firm, and the tops were appropriately indented, which tells me nothing untoward is likely going on inside the jar. (If bacteria manage to survive the canning process, they manifest themselves by their gas output, which first pushes the indented lid up, then breaks the seal. Didn’t appear to have happened.)

So I pulled down a few jars and pried the lids off. They made the appropriate whooshing sound as the vacuum seal was broken. With some trepidation, I held each jar to my nose. The squash smelled…like squash! The okra still had the same strong scent that would have filled my aunt’s kitchen as she sliced and packed them. The beans were, well, beany.

So into the pot they all went! (Along with some broth, some fresh carrots, potatoes and celery, onions, and a more or less random selection of seasonings from the spice rack. Thirty minutes later, and I raise a spoon to my mouth…delicious! So I ladle out a bowl and scarf it down. Mmmmm. That hit just the right spot after a morning of yard work.

That was 6 hours ago, and I am happy to report, I have suffered no ill effects. Now I wonder just how long properly canned veggies can still remain good. Why wouldn’t they just stay good until the lid rusts through?

Do you value your life so lowly? Why would you do this?

When you die, can I have your stuff?

Science!

You may have to wait about 5 decades…

This could become like the culinary version of The Ring.

You mean like the leftover preserves? 'Cause y’know, that’s how this all began.

You should contact Steve! He specializes in this sort of thing.

Ah, nothing makes my evening like a lovely bowl of Botulism du Jour.

As long as you’re making sure to heat that stuff to a boil for a while, you’re probably OK, but damn …

Remember that botulism outbreak on 2007 caused by Castleberry products like chili, beef stew, and the like? Yeah, my brother was sicked by it, and nearly died. He’s STILL having issues related to it. High heat kills botulism; cook at least three minutes at 121ºC/250ºF. Be careful!

(And I say that as someone who’s eaten home-canned food all her life, with no ill effects.)

As the OP mentioned, Clostridium bacteria produce plenty of gas and it’s usually pretty easy to see that in bad canned goods. Also, even if the toxin were present it is heat labile. Boiling the veggies for a bit takes care of that potential problem.

As long as the seal is intact and there is no visible mold or bubbling/foaming the contents are probably fine. Veggies and fruits do get mushy with age and lose flavor but that’s hardly fatal. Being stored in a dark place is a plus for preserving flavor and appearance.

I’m a longtime canner and I sometimes forget what I have on hand. I try to keep an updated list but jars get shoved to the back of the pile and get overlooked for a decade or so. I think the oldest I have eaten were some 12 year old blackberries. Made a very tasty cobbler.

In fact, I just checked my pantry…currently the oldest jars I have are some peaches and nectarines from 1997. It may be cobbler time again soon! (And a new personal record if my math is right.)

If you understand the process and its pitfalls there’s really no need to be freaked out by canned food.

Oh, I should probably mention that as a Medical Technologist I’ve been working in Microbiology for 20 years.

Does your mouth feel less wrinkly now?

Time to fight ignorance!

I thought that while heat kills bacteria, it does nothing to the toxins they produced. What’s the straight dope?

I’m still here, in case you were wondering. And yes, I will be eating my leftover stew for lunch today (not injecting it into my forehead).

Y’all scoff now, but when the apocalypse comes, you will thank me for my bold experiment. :wink: As you rummage through the basement of some old ruined house you will stumble across a cache of veggies that were canned decades before the Darkness fell. And then you will think back to this thread and say “Hmmmm…”

Cooking destroys botulinum toxin:

You might be thinking of endotoxins produced by gram negative bacteria. Those indeed are resistant to boiling having a different structure, they’re lipopolysaccharides. Botulinum toxin is a protein structure and is denatured by high enough heat.

I thought I should add a bit more to that previous post (I’m not really proficient at explanations you may have noticed).

Endotoxins are produced by gram negative bacteria. While the toxin is not destroyed by heat the bacterium itself is so it’s not a worry in properly canned food, more a problem in undercooked foods. On the other hand, Clostridium botulinum has a spore form which is pretty hard to kill. Canned food that isn’t processed at a high enough temperature for long enough can foster it’s growth and subsequent toxin production. It’s an anaerobe and likes an oxygen poor environment.

What about with mushrooms? A long time ago, someone, who IIRC was very familiar with canning, told me you need to take special precautions to can mushrooms. Unfortunately, I can’t remember what she specifically said. Any ideas?

Honestly, I have never canned mushrooms. I’ve pickled a few but just store them in the refrigerator. They would have to be pressure canned I’d think but I’ve no idea of the pressure/time needed. The Ball Blue Book is a great resource for canners, though I’m not sure if it covers mushrooms or not.

Dehydration might be the way to go there.

Have you read (or watched) The Road? An awful lot of it is devoted to canned food, though the protagonist is always careful to check for signs of spoilage.

How was that lunch stew, spoke-?

spoke-?

:confused:

:eek:

The colors…the colors…