Tamarind concentrate: how long will it keep?
I bought some tamarind concentrate (also labelled "nuoc me chua") last month and used some in a recipe. It's been in the fridge since then. I was suprised last night when I opened it and it smelled and looked fine.
How long does it last in the fridge? It is not the block kind, but rather has a runny ketchup-type texture.
The only ingredients listed are tamarind and water. Are there unlisted preservatives at work here? Or is tamarind's acidity to thank?
I have a container in the fridge too. Sounds just like the one you have--plastic jar, formerly foil-sealed top? It's been there for months and as far as I can tell, it's fine. I used some last week mixed with water to make a drink. There were some sugar crystals in it. I can't tell if those were there from the beginning or if they happened with age. I think it lasts because of the acidity, and maybe the sugar.
I can attest that tamarind concentrate keeps well on my pantry shelves for at least 8 months - because the canister of it that I have I bought on my yearly indian grocery splurge last October, and it is just fine. I made some rasam with it just a few days back.
It doesn't seem to require refrigeration -- I always treat it like molasses, myself.