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When life gives you onions...

Shivam_Daryanani_92859

you make onion water.

Thanks to Brandon Byrd for the tip.

Onions sliced extremely thin on a mandolin, dash of salt, vacuum sealed and cooked for 90hours at 90C.

The result...wow, I can't believe these are just onions. Complex. Can't wait to try it in soups,risotto etc.

Sorry about the picture quality.

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tshewman

awesome onion fluid gel too. :-)

fisher23

@Brandon_Byrd_40557 can you do carmelized onions with less cook time, maybe larger piece? I would suspect so, I just haven't tried it yet. But the onion fluids looks great. Do you thicken with agar or gellen?

Brandon_Byrd_40557

I wouldn't try to caramelize onions that way. It wouldn't be any faster if you're really going for dark browning. After 24 hours, white onions turn slightly yellowish. After 48, they're dark yellow going-on-brown. After 72, they're very much brown, but not super-dark. And after 90, they're a deep, dark brown. After that much cooking, much of the flavor has left the onions because the cell walls have been almost totally broken down by extended cooking. They're basically mush (but still strainable). I thought they might be worth keeping (or maybe dehydrating) but I wasn't convinced it would be worth it.
For the onion fluid gel, I've used agar in the past but would have used gellan if I had it on hand at the time.

matthewmicahhall

How does this result compare to what happens with pressure cooked onions? I've heard that you get a similar result (i.e., extremely mellow, sweet onions) but haven't gotten around to actually trying it yet.

Shivam_Daryanani_92859

it's quite different to be honest.

There's more sweetness when pressure cooking them. Plus I don't think you can get away without using any fat. Also I believe when pressuring cooking, you can easily end up burning the onions.

This onion liquid is unlike anything I've ever tried(comparing to onion based liquids of course). If you have a sous vide machine, you should give this a spin.

matthewmicahhall

Thanks -- time to fire up my Anova (waiting for it to eventually break so that I can get a Joule).