Go to the Recipe: Quick Cold-Brew Coffee
How long will the coffee concentrate flavor last vs. traditional toddy method?
What is the post-filtering recommended ratio for the concentrate?
- originally posted by Nate
What is the Benefit off this technique versus making hot coffee and let it cool for 2 hours in the fridge?Despite of infusing other favors in water or alcohol.
The solubility of acids and other water-soluble components of coffee in warm water is much higher than cold water, so hot-brewed and then chilled coffee will taste very different (much more sour) than true cold brew.
Is there a reason to use n20 instead of co2? That is, does the n20 have a chemical effect?
CO2 will make the coffee both fizzy and sour, N2O does not.
Would this work with vodka instead to make a coffee liqueur?
Effect should be similar.
can we go above the 2 hour time limit - say overnight?
Yes, you can. The flavor will be a bit stronger.
How much pressure does the n2o whippets produce within the vessel? What is the max pressure are these vessels rated? Any advantage to higher pressures? How about amtmospheric air compressed to a high pressure of about 200 BAR, granted that I have a properly rated vessel? At what pressure does N2O become supercritical? Does caffeine content increase underpressure?
- originally posted by profssrtwk
Lots of questions here. This is what I can tell you:(1) Unlikely to acheive pressures over 80psig in the whipping siphon. Pressure of the cartridges is (I believe around 600 psi).(2) They are rated to pretty high pressures, but safety features will prevent you from getting much over 80 to 100 psi.(3) In general, it's hard to see a lot more advantage to going much higher in pressure.(4) Critical point is something like 72.5 bar at 36.4C.(5) Atmospheric air isn't very soluble in fats, whereas n2o is, so you will get a different result by using a different gas composition for pressurization.(6) Caffeine content will not increase under pressure. It's mostly limited by solubility in water.
Great video! But I'm not sure about the science behind your new method. The effects of the pressurized container won't be any different than cold-brew at atmospheric pressure. Water is an incompressible fluid. The pressure of the gas above the water-coffee slurry has a negligible effect on the time it takes for cold brewing. Try your standard cold-brew method and filter it after two hours; I'm confident you'll see the same results.
- originally posted by Sam
We've done that side-by-side (controlled triangle test actually) There is a very noticeable difference, and it's worth trying. The difference can be explained by cavitation occurring when the pressure is released and some of the gas dissolved in the liquid flashes out of solution since it's much less soluble under reduced pressure. We talk more about the science here, along with a link to Dave Arnold's work on the topic.http://www.chefsteps.com/activ...
It seems 50/50 ratio of water to concentrate is standard practice. Does this line up with anyone else's experience using this infusion method?
HOLY CRAP! I TRIED THIS AT HOME! IT WAS DELICIOUS, TURNING ORDINARY COFFEE INTO A MUCH MORE SOPHISTICATED, SUBTLE BEVERAGE, NOT UNLIKE AN IMMACULATELY-BREWED CUP OF ESPRESSO. ONLY ISSUE: I DRANK THE WHOLE THING, TURNING MY MIND ONLY TO VOLUME AND NOT CAFFEINE CONTENT. I'VE BEEN SHAKING FROM BEING OVER-CAFFEINATED ALL DAY. SERIOUSLY. AM TYPING IN ALL CAPS FOR A REASON! PERHAPS YOU SHOULD NOTE THE NUMBER OF SERVINGS PER SIPHON IN THE RECIPE!
Well we use it for many things. We say its a concentrate and the caffeine in the coffee wont hurt you, just a real rush;) So we just say its a concentrate and to dilute it to your preferences.
- originally posted by Grant Lee Crilly
It will last as long as any other brew method.
I did a side by side comparison last night. Rather than doing just 2 hours, I did both overnight (beats getting up 2 hours before wanting coffee). I split the recipe in half and used 2 cartridges instead of 3 for a 1/2 liter siphon. The control sample was just in a glass jar. The brew from the glass jar was decidedly more acidic than the siphon method. Not bad, just different. Perhaps most interestingly, my wife liked the one from the glass jar and I liked the other. So it really seems to come down to personal preference!
Is there a simple method of preserving or flash pasteurizing at home to make it stable for a longer period of time after brewing?
How long can the cold brew concentrate keep for in the fridge?
Try brewing suitable* coffee in the regular hot way (using say, an aeropress) and then chilling it. Add the tiniest bit of sugar to correct for the increase in perceived bitterness—and even the tiniest (tiniest!) bit of citric acid to bump the acidity if need be—and you've got a lemonade-like glass of heaven.
*suitable coffees are fruit driven, like Ethiopians, Kenyans, Colombians, etc.
Ummmm ideas on why?
Is it safe to just hammer back in...
Whip-it brand .5L/
did a 3/4 batch of the above recipie
OOOOOOOOOOhhhhhh Cold brewed coffee tequila.....
I know I'm late to this party, but I thought I'd share what I learned. I've been researching whether and how I can use a CO2 tank with regulator to charge my whipping siphon, rather than using the chargers. I inquired from iSi directly about the regular operating pressure; below is the response I received. The short version is that an empty 1 liter whipping siphon is 46.4 psi (1 charger) or 92.8 psi (2 chargers). With 1 liter of chilled water inside, it's 188.5 psi (1 charger) or 246.5 psi (2 chargers). Those pressures will drop slightly as the water absorbs the N2O or CO2 (though CO2, being more soluble in water, will drop more). Here's what I got from iSi:
If you charge an empty 1 liter cream whipper bottle with 1 x iSi cream charger the pressure inside the whipper will be approximately 46.4 psi (3.2 bar). If instead you charge the whipper bottle with 2 x iSi cream chargers you will simply get double the pressure (92.8 psi or 6.4 bar). If instead of using cream chargers you decided to use soda chargers the pressure will be almost the same.
Determining the pressure inside a 1 liter cream whipper when it is filled with either heavy cream or water turns out to be a very difficult thing to calculate without specialized measure equipment. Luckily iSi has the equipment needed to measure this so I was able to get you some answers:
A 1 liter cream whipper bottle filled with 1 liter of chilled water (t= 7.5°C) and charged with either 1 or 2 cream or soda chargers:
1 x iSi cream or soda charger (whipper not shaken) = the pressure inside the whipper is approximately 188.5 psi (13 bar).
2 x iSi cream or soda chargers (whipper not shaken) = the pressure inside the whipper is approximately 246.5 psi (17 bar).
NOTE- If you shake the cream whipper bottle (say 5 times) the pressure will reduce due to the solubility of CO2 or N2O gas in water. In this scenario, the shaken bottle pressure will be less when using soda chargers than when using cream chargers due to the higher solubility of CO2 in water (compared to than of N2O). If the 1 liter cream whipper bottle is instead filled with heavy cream the pressures will be similar as above with the exception that the pressure of the N2O (cream charger) filled bottle will be slightly lower. Again this has to do with the high solubility of N2O in fat (cream). Simply put N2O dissolves better in fat than CO2.
The biggest influences on the internal pressure of a cream whipper are as follows:
1. The quantity of filled cream/water in the canister. The less cream/water in the bottle, the less the internal pressure will end up being.
2. The temperature also influences the internal pressure. In general, the lower the temperature of the liquid the lower the pressure will be.
3. The type of liquid…this has to do with the solubility of the gas in the liquid. The higher the solubility of the gas in the liquid the lower the internal pressure. Note- the solubility of N2O in cream depends on the fat content…the higher the solubility, the lower the internal pressure of the bottle.
It was overpressurized. I emailed iSi asking about operating pressures in their 1 L siphon (see my comment below). They told me there is no pressure release safety valve. Instead, the concave bottom serves as a safety feature and pops out if there's too much pressure. I would guess that it's not safe to reuse after hammering back in.
I don't have an iSi (yet!) so I can't try it. But I'm curious: seems like "nitro cold brew" is the new hotness in the coffee world. Pretty easy to google. If you don't release the N2O, would you get an effect similar to cold brew on a nitro tap? I.e. foamy like a guinness?
What's the recommended ratio between concentrate and water - I'm new to this
Hello from germany, i had a traditional cold brew yesterday at brunswick kaffee-fabrik. Is there anybondy who can answer how long the cold brew will stay without looses of taste? How long can you store it and keep it fresh. Is there any method to pasteurize? Thank you in advance for any answers. André
The issue with that is at you'd get coffee grounds stuck in the valve. What you might be able to do is filter out the coffee grounds and then put the concentrate back into the siphon, charge with N2O and then release. You'd go through a lot of cartridges but it might work. Perhaps the good folks at ChefSteps can advise on how to take the next step to nitro cold brew!
One of the issues with this is that the N2O is not the same as the N2 gas used in brewing. What makes a nitro stout so creamy is that the solubility of N2 gas is much lower than that of N2O. It comes out of solution readily, making those tiny bubbles that cause a creamy head. You would have a different effect with N2O, as the solubility is 1.2 g/L vs the 20 mg/L of N2 gas. You will get a foamy head from N2O if the beverage that you're making has a lot of fat in it, more than likely, but not the same as the N2 gas.
I tried putting regular coffee into the siphon, charging it up with N2O, chilling it for a few hours, and then discharging it through the spout. It did not produce "nitro coffee" - it was basically all head in the glass, and then when the foam subsided, it was indistinguishable from normal iced coffee.
Would this work with a Soda Stream, if the method is changed slightly – perhaps to include a longer steeping time?
my iSi profi 1 L whipper has maximum with 2 cartridges
can i use just 2 ?
Quite a simple question: Why does the exact same coffee I use for normal pour-over, which works fine everyday, completely clog up my filter? It seems almost as though the coffee has soaked up to a fine bloety mass. Filtering that out has been a bitch.
Probably yes, but more pressure = more cavitation = more flavour more quickly.
Also I have just tried with three capsules. Me as well as the Isi are still breathing.
Well that was good!
I'm taking some home, 45 day, dry aged (drybagsteak.com) Prime prime rib roast (two 5 bone sections cooked sous vide) to my sister's house for Christmas dinner this year. This may be the perfect enrobing after searing to cement my meat-master reputation.
CO2 will dissolve readily into the water and make carbonic acid, the same stuff that acidulates seltzer water. It'll make your coffee NASTY tasting. I tried carbonating coffee to make a coffee soda, and it is really awful stuff. Unless you like it jaw-clenchingly acid, don't bother.
I still have an ancient Toddy Coffee brewer up in my cabinet. I lost the cork and don't have any more filters for it, so I'd have to replace them to use it. I think the carafe is still intermittently being used as a tea pitcher...
Wow. 100 g of coffee (enough for 12 "standard" 5-oz cups of coffee) in 500 ml of water. I have a 1 pint ISI so I did 50 g in 250 ml of water and ended up with a fairly small amount of extract (maybe 100-150 ml? Sorry, should have measured) and a filter full of mud. Diluted about 3:1, it was tasty but wow, is this inefficient. And pretty messy. Or seems so to me.
Andre, from my research it appears that cold brewed coffee can last up to a month refrigerated because of the low acidity, however I've never gotten to test it out since we drink it faster than we can make it. Cheers!
Is that the quart size iSi whipper?
Yes indeed!
Nice but how can you say this is a rapid way to brew it? Just brew it hot in just any way and put some ice in it!
It's definitely slower than hot brew, but way, way quicker than traditional cold brew techniques, which take about 24 hours.
Cold brew vs hot brew make completely different coffees. A traditional cold brew can range anywhere between 14-20 hours. So, at two, this is pretty rapid lol trying it tonight actually!
Not only that, but they taste completely different. Both are coffee, but they have drastically different flavor profiles.
Agreed with Melba. At least 2 weeks refrigerated because of the low acid. But as with Melba it never makes it past a few days at our house as it is drank! And pasteurization would kind of defeat the purpose of cold brew (in my opinion). Just make sure your equipment is clean.
You can get generic rubber stoppers on amazon.com for pretty cheap.
Hi,
After brewing how long can you keep in the fridge?
Thinking of getting a siphon, but would like to know if the cartridges are universal?
I tried charging with 3 cartridges, but after the second one, the third cartridge mostly releases the gas after I unscrew the charger casing. I've tried this twice now with the same results. Seems like I can't get 3 in there. Should I be swirling each time?
If kept in an airtight jar/container it would be good to keep for about 2 weeks.
In my experience they are all interchangeable.
Yes, they are. The only difference between cartridges (make sure you buy the right SIZE, however, because a 12g cartridge will not fit an 8g charger, the ISI siphon chefsteps uses is truly fantastic, and uses 8g) is threaded or not. Non threaded cartridges will fit threaded receivers, but not vice versa. the vast majority are not threaded, however. I would suggest avoiding the CO2 used for BB guns or non-food applications, they can sometimes have a tiny amount of machine oil to lubricate the thing they're using (not good eats)
After having a home charging bottle literally grenade in my hands (and getting fifteen stitches) I was more than happy to throw down my money at the ISI siphon for safety and quality. These things with even 8g are dangerous.
If you're using 12gram cartridges, two of them is the same as three of the 8 gram ones that the ISI one in the video uses. My ISI takes three no problem.
I've made this three times now. Always turns out perfect, tastes absolutely fantastic even with cheap Yuban coffee! Absolute hit with everyone I've given it to.
Was that a happy coincidence that you suggested watching Black Mirror? I decided to do this when I was watching Black Mirror!
How would you scale the recipe for a 0.5 L whipper?
1/2
isi makes N2 cartridges, but they don’t fit the whip cream siphon (isi has separate nitro siphon product line). Ico makes N2 cartridges that fit isi and other standard whippers. You can find them on Amazon.
Yes, so leave the 3rd cartridge in.
