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Cold brew coffee in 3 minutes using acoustic cavitation

unsw.edu.au

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Re: Cold brew coffee in 3 minutes using acoustic cavitation

#111

Post by SamBam »

lamename wrote: post #32
dahart wrote: post #17

Recently I discovered that many coffee shops, maybe half in my sampling of a couple dozen in different cities, are selling cold coffee (brewed hot, then refrigerated) under the name cold brew, and even the ones that actually cold-brew them seem to be under the impression that it needs to be served cold. I was laughed at in one hipster joint for asking for a steamed or warmed cold-brew, and another one initially refus…

Thank you for saying this. When cold brew first came out, it was promoted as a brewing process that resulted in smoother (I'm guessing lower acidity) tasting coffee. Heating it up seemed natural, and its use in iced coffee seemed simply opportunistic. (In my experience at least). Then it quickly caught on as a novelty, with nitro et al, and when I tell people I drink cold brew warmed I get looks of confusion or turne…

Barismo in Cambridge does (or did) a "hot draft" coffee, that is always on tap, is delicious, and is remarkably like hot cold brew. Their method is apparently a secret (although I'm sure more digging could find it), but I wouldn't be surprised if it wasn't basically on-demand heated cold brew. [1]

1. https://www.baristamagazine.com/the-function-and-future-of-b...

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#113

Post by SamBam »

petre wrote: post #101
dahart wrote: post #17

Recently I discovered that many coffee shops, maybe half in my sampling of a couple dozen in different cities, are selling cold coffee (brewed hot, then refrigerated) under the name cold brew, and even the ones that actually cold-brew them seem to be under the impression that it needs to be served cold. I was laughed at in one hipster joint for asking for a steamed or warmed cold-brew, and another one initially refus…

That reminds me of the Soul Kitchen movie when a client of a fancy restaurant asked for a hot gazpacio. The waiter escalated to the chef who calmly explained to the client what a gazpacio is. After the client insisted, shouting at him, the chef refused driving his knife into the client's table. https://youtu.be/rQ61MfRBSQg

> We had gazpacho soup for starters... I didn't know that gazpacho soup was meant to be served cold. I called over the chef and told him to take it away and bring it back hot! So he did... the looks on their faces still haunt me today! I thought they were laughing at the chef, when all the time they were laughing at me as I ate my piping hot gazpacho soup! I never ate at the Captain's table again. That was the end of my career. – Rimmer, Red Dwarf

https://www.youtube.com/watch?v=3ZGJHDegPcU

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#115

Post by LargoLasskhyfv »

kurthr wrote: post #66
dahart wrote: post #40

Earlier quoted context omitted.

> brew temp and serving temp are orthogonal Yes!!! I’m biting my tongue a little on how infuriating the process has been to ask cafes for warmed cold brews, but you’re spot on and exactly right. I’m baffled that so many people who sell coffee for a living, think they know a lot about it, and act like coffee snobs, don’t seem to understand what cold brew even is. (Or, in a few cases in my sampling I’m certain it was w…

It's funny cuz Charbux has no problem pouring hot espresso into cold ice milk with caramel and cream on top. I think it's pretty clearly just "baristas" justifying not changing their process, which is fine if a bit lazy and argumentative. Many coffee people are totally interested in finding new ways to do stuff, but they have to have the mental space to do it.

Funny. Exactly that stuff is the only reason I've ever entered a Starbucks.

Venti!

But TBH one can do that with better coffee, caramel sirup, some crushed ice from the fridge, and even spray cream out of a can for much less money, just not 'on-demand' and anywhere/anytime.

Also, too much (spray) cream and caramel in Venti amounts can't be that good for your body.

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#116

Post by bongodongobob »

iancmceachern wrote: post #21
triceratops wrote: post #14

Earlier quoted context omitted.

> The system connects a bolt-clamped transducer with the brewing basket via a metallic horn – transforming a standard espresso filter basket into a powerful ultrasonic reactor. Now it can be done without shelling out $695 for a dedicated machine. That's progress. I wouldn't be so dismissive.

But you have to shell out $10k for a commercial ultrasonic welder from Branson, etc. Just the horn they show in the paper probably cost $6k to make. I wouldn't be too dismissive.

They make ultrasonic jewelry cleaners for $75 that should work just fine. You're referencing something that is intended to be used with hundreds of gallons of water.

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#117

Post by klyrs »

ok123456 wrote: post #80
ada1981 wrote: post #58

Earlier quoted context omitted.

The more complex, expensive and counter intuitive your morning coffee, the better! 90% of the experience is looking cool!

You can buy cold brew coffee at Costco in bulk in cans. Just throw some in the fridge.

I was excited by this in theory, but it's some of the worst cold brew I've had. For shame, Costco is usually pretty good for selecting quality. Then again, my favorite preparation of cold brew is a shot of concentrate straight from the toddy.

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#118

Post by deadlydose »

janalsncm wrote: post #73
bananskalhalk wrote: post #55

Earlier quoted context omitted.

Chilling warm brewed coffee is definitely faking it. And I presume all places selling "cold brew" is faking it so this guy is losing money by not showing off doing real cold brew with his apparatus.

It’s a market for lemons at this point. Unless you can see an expensive apparatus or observe them soaking the coffee, there’s no way to know if it’s correct, and as a customer it means it’s risky to buy if you care about the difference between refrigerated hot coffee and cold brew.

Risky to buy? It's not real estate it's a cup of coffee. And if you're worried about people faking it, just buy a $2 mason jar and make some in the fridge while you sleep.

I don't get the fascination with paying exorbitant prices and constantly complaining when it's next to zero effort to make it at home, cold or hot. And the best part is you get to choose where your beans come from, you don't have to worry about the political slant du jour of the coffee shop, and you can do it all for a fraction of the price even when using the most expensive beans.

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#119

Post by hinkley »

kurthr wrote: post #66
dahart wrote: post #40

Earlier quoted context omitted.

> brew temp and serving temp are orthogonal Yes!!! I’m biting my tongue a little on how infuriating the process has been to ask cafes for warmed cold brews, but you’re spot on and exactly right. I’m baffled that so many people who sell coffee for a living, think they know a lot about it, and act like coffee snobs, don’t seem to understand what cold brew even is. (Or, in a few cases in my sampling I’m certain it was w…

It's funny cuz Charbux has no problem pouring hot espresso into cold ice milk with caramel and cream on top. I think it's pretty clearly just "baristas" justifying not changing their process, which is fine if a bit lazy and argumentative. Many coffee people are totally interested in finding new ways to do stuff, but they have to have the mental space to do it.

Pouring hot coffee onto plastic…

Re: Cold brew coffee in 3 minutes using acoustic cavitation

#120

Post by windexh8er »

csmpltn wrote: post #53
dahart wrote: post #17

Recently I discovered that many coffee shops, maybe half in my sampling of a couple dozen in different cities, are selling cold coffee (brewed hot, then refrigerated) under the name cold brew, and even the ones that actually cold-brew them seem to be under the impression that it needs to be served cold. I was laughed at in one hipster joint for asking for a steamed or warmed cold-brew, and another one initially refus…

This is an extreme form of coffee hipsterism. “Cold brew, but steamed please”. Brother, this is starting to get ridiculous.

For people who are accustomed to cold brew (we always have cold brew in the fridge and grounds steeping) there's a very large difference in flavor and profile using the same beans. This also translates when it's heated, although I will say I don't do that often because I enjoy it cold more than hot.

I'd disagree though that it's "extreme". There are local chains in my area (Midwest - US) that offer a variety of hot cold brew drinks that are quite popular offerings. I was pleasantly surprised when I ran across this more than a year ago. But I still do run into a number of coffee shops where baristas fail to understand the difference between cold brew and an iced coffee. There's really no comparison when you're explicitly looking for cold brew. It's also often hard to find available in the winter months in my region. Not sure why, but to me that's akin to pausing ice cream sales because there's snow on the ground. Just because it's a cold drink doesn't mean I don't drink it during cold weather.

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