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I have a jar of organic tahini which expired one year ago.

It smells good and tastes ok. I don't know how it was stored, it was however always sealed (but already opened).

Is it safe to eat in large ammount ?

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How far past the expiry are you at the moment? –  codeinthehole Jul 19 '10 at 17:49
    
About one year. –  kevin Jul 21 '10 at 17:26
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5 Answers 5

For what it's worth, you can safely store opened sesame oil in a refrigerator for one year (stilltasty.com).

Peanut butter can be kept for 3 months in the cupboard, then another 3-4 months in the refrigerator.

To be safe, I'd say keep it refrigerated once it's been opened, and use it within 6 months. I've had some for about that long, and it's just fine still.

Remember: bad odors indicate bad food.

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I've had the same giant can of peanut butter for over a year. I took it on a road trip for a month, and it has been sitting in my cupboard since. As best I can tell, nothing bad has happened to it. –  Adam Shiemke Jul 19 '10 at 18:10
    
Oh, I personally have kept peanut butter for much more than 3 months in the cupboard... just quoting more official "safe" practices. I'm sure the temperature, quality of product, whether or not there's preservatives, etc. make a difference. –  JustRightMenus Jul 20 '10 at 1:10
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To the best of my understanding, Tahini is a lot like honey in this respect. It has no moisture in it, and will therefore suck the life out of anything that tries to land on it. Theoretically, as long as there's no water there, it'll basically last forever.

I usually keep mine in the fridge, not for temperature control but to keep the humidity away. I do live in a swamp though. I'm still using some I bought about 7 months ago, and it's fine.

Once it's been prepared (i.e. mixed with water) it's good for 3-4 days.

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It contains lots of unsaturated fats, which can go rancid if exposed to air, and will pick up 'fridge flavors'. –  Adam Shiemke Jul 19 '10 at 18:11
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Maybe. I don't think that it would support botulism, so you probably won't die (unless you have a deadly sesame allergy). I don't imagine a lot of bacteria will grow on it, either. The only thing I can think that might happen is that is oxidizes or picks up strange flavors, at which point it would just taste bad.

This is mostly guesswork. Proceed at your own risk (I'd eat it).

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Tahini is sesame seed paste, which means it's mostly an oil emulsion. That much oil, without other preserving intervention, will harbor bacteria and oxidize. If it isn't giving off any funky flavors or odors, it might be fine. Still, tahini is cheap, why chance it?

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I'm fairly sure that bacteria can't live solely in oil. It lacks any moisture, which I suspect is necessary for bacterial growth. –  Adam Shiemke Jul 19 '10 at 18:12
    
Nothing is completely void of moisture. Still, even without the bacteria it will oxidize since it is mostly fat. Also the existence of an expiration date itself suggests that the product may contain an ingredient that has a finite shelf life. Lots of possibilities here, to which I reiterate that tahini is cheap. –  yock Jul 19 '10 at 18:18
    
True why chance it ? Thing is I really don't like to waste food and am curious if it's really unsafe. –  kevin Jul 21 '10 at 17:25
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As long as it's kept in an airtight jar, it can hold for more than one year after opening. However, as time passes Tehini tends to lose its flavor, so it's best used as soon after opening as possible.

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