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iced aeropress blues
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Kelham
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Kelham
Joined: 14 Apr 2009
Posts: 34
Location: Vancouver
Expertise: I love coffee

Posted Sat Jun 23, 2012, 3:56pm
Subject: iced aeropress blues
 

I've been using the iced aeropress recipe from here and keep getting a sour tasting coffee. Any idea why? I'm using a Costa Rica Tierra Fertil from 49th, although I've had the same problem with a Ethiopia Sidamo as well.

Help!
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andys
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andys
Joined: 10 May 2003
Posts: 866
Location: NY
Expertise: Just starting

Espresso: Speedster, Londinium 1
Grinder: EK-43,Robur, HG One, M3
Vac Pot: Yama
Drip: various
Roaster: PIDed Popper
Posted Sat Jun 23, 2012, 8:16pm
Subject: Re: iced aeropress blues
 

Kelham Said:

I've been using the iced aeropress recipe from here and keep getting a sour tasting coffee. Any idea why? I'm using a Costa Rica Tierra Fertil from 49th, although I've had the same problem with a Ethiopia Sidamo as well.

Posted June 23, 2012 link

Sounds like you're using Mark's Aeropress Iced Coffee method.

IMHO, it's a challenging recipe, and it's not surprising that your coffee tastes sour.

Mark's brewing ratio is way, way high. Putting it in English, that means he's using a very big dose of ground coffee paired with a very small amount of water. Despite the fact that he says, "it is quite easy to over-extract and deliver an excessively bitter brew," I think the opposite:  it's actually quite easy to underextract, since there is so little water to do the extracting. Underextraction often leads to sour flavors, which is what you report. Underextraction also wastes coffee, since one has to dose higher than usual to achieve your desired coffee strength.

James Hoffmann recently made a similar point on his blog.

Nowadays many coffeegeeks are using lighter roasted coffee for iced methods. These coffees may really shine in the summertime with their crisp acidity. But they are harder to extract, making their acidity morph into sourness.

I think you will have more success using a lower dose of dry grounds and a higher amount of brew water.

 
-AndyS
picture page:  http://flickr.com/photos/andy_s/sets/
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Kelham
Senior Member
Kelham
Joined: 14 Apr 2009
Posts: 34
Location: Vancouver
Expertise: I love coffee

Posted Sun Jun 24, 2012, 10:10am
Subject: Re: iced aeropress blues
 

andys Said:

Sounds like you're using Mark's Aeropress Iced Coffee method.

IMHO, it's a challenging recipe, and it's not surprising that your coffee tastes sour.

Mark's brewing ratio is way, way high. Putting it in English, that means he's using a very big dose of ground coffee paired with a very small amount of water. Despite the fact that he says, "it is quite easy to over-extract and deliver an excessively bitter brew," I think the opposite:  it's actually quite easy to underextract, since there is so little water to do the extracting. Underextraction often leads to sour flavors, which is what you report. Underextraction also wastes coffee, since one has to dose higher than usual to achieve your desired coffee strength.

James Hoffmann recently made a similar point on his blog.

Nowadays many coffeegeeks are using lighter roasted coffee for iced methods. These coffees may really shine in the summertime with their crisp acidity. But they are harder to extract, making their acidity morph into sourness.

I think you will have more success using a lower dose of dry grounds and a higher amount of brew water.

Posted June 23, 2012 link

Thanks Andy. Could you recommend a dose for me to start out with, assuming I'm using the max amount of water the Aeropress can take?
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andys
Senior Member
andys
Joined: 10 May 2003
Posts: 866
Location: NY
Expertise: Just starting

Espresso: Speedster, Londinium 1
Grinder: EK-43,Robur, HG One, M3
Vac Pot: Yama
Drip: various
Roaster: PIDed Popper
Posted Sun Jun 24, 2012, 11:36am
Subject: Re: iced aeropress blues
 

Kelham Said:

Thanks Andy. Could you recommend a dose for me to start out with, assuming I'm using the max amount of water the Aeropress can take?

Posted June 24, 2012 link

cup I just made a few minutes ago:

Technique:            inverted Aeropress with paper filter, pressed over ice
Coffee type:         Intelligentsia Burundi
Dry coffee dose:   25 grams
Grind:                   pretty fine -- 12 on my Virtuoso -- YMMV
Brew Water:         190 grams @ about 205F -- fits OK if the coffee isn't too fresh
Stirring:                a couple times, gently
Steep Time:          3 min, then gently press
Ice in Cup:            150 grams

 
-AndyS
picture page:  http://flickr.com/photos/andy_s/sets/
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Sun Jun 24, 2012, 1:02pm
Subject: ...
 

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