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Wednesday, June 25, 2008
Why is fresh coffee so confusing?
This is one problem this industry really needs to get in gear on. We have this muddled idea of fresh ending at fresh roasted. Even the most transparent and progressive roasters are a bit vague on how far coffees are from harvest and that presents a crossroads for our industry.
When I think of fresh, there are four parameters: harvest, roast, grind, brew.
Harvest fresh being within 3-4 months off milling from parchment state or progressively packed in 'non-jute' to preserve that fresh flavor profile. From 4-7 months off harvest, coffees will be fine but aromas will already begin to diminish. 6 months and on, you are pushing how well the coffee can hold up and the acidity will diminish or turn rancid. Forget the soft coffees from places like Brasil or Colombia, they will be long gone by then. Wood, paper, lacking aroma... Do I really need to explain this again?
Roast freshness is the boutique industry(the online cognoscenti and niche roaters) standard. This seems to be the only way most 'Specialty' roasters distinguish themselves from the major chains. While most aggregate to the 2 week mark, a handful put best by dates going as far as six months out. You can almost guarantee these roasters have a market at a Whole Foods type grocer where turnover is hard to control. No roast date though, no idea of freshness.
Grind is a shop to shop issue. While more and more shops are grinding fresh or on demand, a lot of shops are still using the auto feature and filling hoppers or pre grinding drip brew. Whether the blades are serviced or sharp is another issue. As a home user, unless you absolutely cannot afford a grinder, there is no excuse for pre grinding coffee. Think of it this way: The bean is the final package and once it's open, all the flavors can escape.
Brewing fresh is a classic pitch that goes way back. Everyone has experienced the poor flavor of a pot that sat too long.
How important are all of these factors really? Do the customers care?
In the common market place, probably not. When you are asked to justify paying a bit extra for a shot or you are requested to splurge a bit at a cafe, yes. Not every shop in every market place can make these points matter but if one boutique roaster jumps in the deep end on all these points, it's likely many others will follow. Think about what that would mean for the purists among us wishing to really treat certain coffees like high end teas or begin to glimpse the wine model of labeling and marketing. A few bits and pieces to chew on while you think about what goes in your cup.
This is one problem this industry really needs to get in gear on. We have this muddled idea of fresh ending at fresh roasted. Even the most transparent and progressive roasters are a bit vague on how far coffees are from harvest and that presents a crossroads for our industry.
When I think of fresh, there are four parameters: harvest, roast, grind, brew.
Harvest fresh being within 3-4 months off milling from parchment state or progressively packed in 'non-jute' to preserve that fresh flavor profile. From 4-7 months off harvest, coffees will be fine but aromas will already begin to diminish. 6 months and on, you are pushing how well the coffee can hold up and the acidity will diminish or turn rancid. Forget the soft coffees from places like Brasil or Colombia, they will be long gone by then. Wood, paper, lacking aroma... Do I really need to explain this again?
Roast freshness is the boutique industry(the online cognoscenti and niche roaters) standard. This seems to be the only way most 'Specialty' roasters distinguish themselves from the major chains. While most aggregate to the 2 week mark, a handful put best by dates going as far as six months out. You can almost guarantee these roasters have a market at a Whole Foods type grocer where turnover is hard to control. No roast date though, no idea of freshness.
Grind is a shop to shop issue. While more and more shops are grinding fresh or on demand, a lot of shops are still using the auto feature and filling hoppers or pre grinding drip brew. Whether the blades are serviced or sharp is another issue. As a home user, unless you absolutely cannot afford a grinder, there is no excuse for pre grinding coffee. Think of it this way: The bean is the final package and once it's open, all the flavors can escape.
Brewing fresh is a classic pitch that goes way back. Everyone has experienced the poor flavor of a pot that sat too long.
How important are all of these factors really? Do the customers care?
In the common market place, probably not. When you are asked to justify paying a bit extra for a shot or you are requested to splurge a bit at a cafe, yes. Not every shop in every market place can make these points matter but if one boutique roaster jumps in the deep end on all these points, it's likely many others will follow. Think about what that would mean for the purists among us wishing to really treat certain coffees like high end teas or begin to glimpse the wine model of labeling and marketing. A few bits and pieces to chew on while you think about what goes in your cup.
Labels: age, fresh coffee, green coffee, stale coffee
¶ Jaime van Schyndel 12:06 PM 3 Comments
Saturday, December 16, 2006
Green coffee ages but what does that mean?
Stale: Having lost freshness, effervescence, or palatability.
Is it that simple for your green coffee? Is it possible that over time, something changes, and your coffee can lose it's flavor even before it is roasted?
The answer is surprisingly complex. In fact, to what level could depend completely on the coffee itself and the original flavors present. There is most definitely no catch all answer. Some coffees may show this "agey" flavor change whereas others may not show perceivable age. The important part in analyzing this is roasting in a way that you can perceive a difference. The one thing that is certain is that 'something' is changing whether we can perceive it or not.
Chemical and structural changes happen over time in storage that have been well documented. Temperature, humidity, and light seem be the things that can expedite those changes. It should be a given that exposure to chemical agents, molds, and other contaminants should be avoided but these can also contribute to biodegradability.
George Howell has pointed to lignins previously as proof of the biodegradability of coffee seeds. Lignin is a biodegradable plant material that is hydrophobic. This means it is water resistant and resists pathogens entering or possibly flavors escaping while acting like a glue binding the seed together. Coffee seeds are very waxy, so it really brings up the question of how hydroscopic the coffee is in the green state and what part that plays into the flavor changes. Lignins are only about 2% of the total coffee mass so it remains to be seen if this 'glue' is the sole culprit in bean decomposition or plays a part along with volatile flavor components that may escape over time.
What is truly curious is the relationship between sugars and how flavors form as well as the overwhelming topic of moisture content. Sugars are increasingly interesting according to the research on low molecular weight sugars in green and roasted coffee collected in Ivon Flament's 'Coffee Flavor Chemistry
.' Poor storage was believed to result in an increase of glucose which correlated with a marked increase in woody/rubbery notes in the coffee. There was also an increase in water content during the same period, so it remains that moisture content of the bean is an easier measure of green quality than a quantitative sugar analysis. Storage in tropical temperatures (such as at origin) can even induce chemical changes such as the Maillard reaction in the green coffee.
So what does that tell you food scientists?
There are changes in coffee in the time it is stored that need to be addressed by expedited shipping, better storage method, and possibly freezing green.
Is that conclusive proof that we should all start flying coffee from origin and freezing green? No. What it points to is that we need to set up conditions where we can do a qualitative analysis of the changes coffees in storage go through and continue pursuing the upgrades you see from pioneers like Daterra Farm in bagging.
From a recent experiment we did with a CoE quality green stored in air conditioned storage and one frozen over the last year, we had a very stark contrast in the two. The differences we have noted are that floral citrus notes in wp centrals, wp Yirgs, and clean Kenyas appear to disappear over time to be replaced with a woodsy dull lifeless note and an unpleasant wheat or barley flavor. Aromatics disappear first, followed by changes in the citrus notes. Naturals turn quickly from the soft over ripe fruit into very muddy rotten fruit flavors over time in storage. We don't have enough notes on controlled dry process to state definitively what is changing.
Those are just our evaluations and this is a challenge to roasters to make their own evaluations and share their observations. Keep in mind that if the green quality isn't already very high, you may not notice the changes. This is not something to invest in your Sumatra at $1/lb but might make sense for that $20/lb CoE Guatemala.
Point being, if you paid a lot for this coffee, you should research keeping it in it's best shape as long as possible whether you are a professional roaster or the home variety.
Stale: Having lost freshness, effervescence, or palatability.
Is it that simple for your green coffee? Is it possible that over time, something changes, and your coffee can lose it's flavor even before it is roasted?
The answer is surprisingly complex. In fact, to what level could depend completely on the coffee itself and the original flavors present. There is most definitely no catch all answer. Some coffees may show this "agey" flavor change whereas others may not show perceivable age. The important part in analyzing this is roasting in a way that you can perceive a difference. The one thing that is certain is that 'something' is changing whether we can perceive it or not.
Chemical and structural changes happen over time in storage that have been well documented. Temperature, humidity, and light seem be the things that can expedite those changes. It should be a given that exposure to chemical agents, molds, and other contaminants should be avoided but these can also contribute to biodegradability.
George Howell has pointed to lignins previously as proof of the biodegradability of coffee seeds. Lignin is a biodegradable plant material that is hydrophobic. This means it is water resistant and resists pathogens entering or possibly flavors escaping while acting like a glue binding the seed together. Coffee seeds are very waxy, so it really brings up the question of how hydroscopic the coffee is in the green state and what part that plays into the flavor changes. Lignins are only about 2% of the total coffee mass so it remains to be seen if this 'glue' is the sole culprit in bean decomposition or plays a part along with volatile flavor components that may escape over time.
What is truly curious is the relationship between sugars and how flavors form as well as the overwhelming topic of moisture content. Sugars are increasingly interesting according to the research on low molecular weight sugars in green and roasted coffee collected in Ivon Flament's 'Coffee Flavor Chemistry
.' Poor storage was believed to result in an increase of glucose which correlated with a marked increase in woody/rubbery notes in the coffee. There was also an increase in water content during the same period, so it remains that moisture content of the bean is an easier measure of green quality than a quantitative sugar analysis. Storage in tropical temperatures (such as at origin) can even induce chemical changes such as the Maillard reaction in the green coffee.So what does that tell you food scientists?
There are changes in coffee in the time it is stored that need to be addressed by expedited shipping, better storage method, and possibly freezing green.
Is that conclusive proof that we should all start flying coffee from origin and freezing green? No. What it points to is that we need to set up conditions where we can do a qualitative analysis of the changes coffees in storage go through and continue pursuing the upgrades you see from pioneers like Daterra Farm in bagging.
From a recent experiment we did with a CoE quality green stored in air conditioned storage and one frozen over the last year, we had a very stark contrast in the two. The differences we have noted are that floral citrus notes in wp centrals, wp Yirgs, and clean Kenyas appear to disappear over time to be replaced with a woodsy dull lifeless note and an unpleasant wheat or barley flavor. Aromatics disappear first, followed by changes in the citrus notes. Naturals turn quickly from the soft over ripe fruit into very muddy rotten fruit flavors over time in storage. We don't have enough notes on controlled dry process to state definitively what is changing.
Those are just our evaluations and this is a challenge to roasters to make their own evaluations and share their observations. Keep in mind that if the green quality isn't already very high, you may not notice the changes. This is not something to invest in your Sumatra at $1/lb but might make sense for that $20/lb CoE Guatemala.
Point being, if you paid a lot for this coffee, you should research keeping it in it's best shape as long as possible whether you are a professional roaster or the home variety.
Labels: age, article, coffee, green
¶ Jaime van Schyndel 5:16 PM 2 Comments
