Daniel's World of Coffee

Word Clouds for Different Varietals

Here is some more analysis, in visual form, of the soil and varietal analysis I did of last year's coffee crop in Puerto Rico. I entered each word every time it appeared on a cupping form, and correlated the data with different varietals. I have many of these charts made, but the files are large, so I'm posting just four here to give you an idea of how they look.

Most of these descriptors are aromatics, because the standard cupping forms have numerical scores for acidity, flavor, balance, and other major categories. Still, if a cupper (myself included) made a note of anything specific, no matter what the category, I included it in these diagrams.

The larger the word is, the more often it came up. The colors are included for contrast only — there is no data attached to the word colors. Click on the pictures to see them up close.

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Fig. 7: descriptors for BOURBON Strong positive aromatics, including notable honey, chocolate, toast, and caramel. Strongest presence of the very positive sweet, as well as the positive tangy.

Fig. 4: descriptors for CATIMOR Dry is the dominant characteristic, indicated a dry, unpleasant mouthfeel or aftertaste. Ordinary nutty aromatics dominate, with malty tendencies. Negative peanutty and astringent notes are common.

Fig. 9: descriptors for TOP NINE COFFEES (all varietals) In all we find that the very best Puerto Rican coffees tend to be sweet, bright, tangy and smooth or delicate, with high incidence of honey, nutty, lemon, caramel, chocolate, toast, and floral aromatics

Fig. 10: descriptors for BOTTOM NINE COFFEES (all varietals) Overall, below-average to poor Puerto Rican coffees suffer from musty and peanutty aromatics, and show high incidence of sourness, dryness, and a lack of sweetness.

Does Altitude Matter More For Certain Varietals Than For Others?

Here are some of the results I've compiled of our large project classifying soil types and investigating the influence of soil, climate, and varietal on cup quality in Puerto Rico.

These graphs and comments are part of a much larger report, with databases and maps, which will be released soon. Just a little preview, which I hope you find interesting. The purpose of this project is to help farmers improve quality and prices in Puerto Rico. All the data collected, and all of the analysis, will be published and distributed to farmers (in Spanish and Enlgish), so that they can put our findings into action for their own benefit.

How did I arrive at these data points? The altitude and varietal information was provided by the USDA researchers in Puerto Rico. Each sample was collected individually, and sample collectors made a GPS recording on-site, standing next to the trees from which the cherries were taken. These readings include latitude, longitude, and altitude above sea level. The cupping scores are the result of a week of extensive blind cupping done by a team of Q-graders (myself included) in California, in May. Each sample was cupped multiple times, in random order, and the scores you see here are means taken from all the individual scores recorded.

The portion quoted here refers to other sections of the document which are not publicly available yet. Sorry, you'll just have to wait!

(click on graphs to embiggen)

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Altitude

There is a strong correlation between the quality of the samples and the altitude at which the coffee was grown at. As one would expect, generally speaking, the higher the coffee was grown, the higher it scored on the cupping table. This is one of the strongest relationships we found in all the data.

While not all of the high-grown coffees were in the very upper echelon of cupping scores, most of them were. And the relationship is even stronger at the low end of the spectrum. All of the lowest scoring coffees belonged in the lower altitude categories.

The following graph illustrates the relationship between coffee quality and altitude, across all varietals and soil types:

This graph shows an average gain in quality of just over 2 points from the lowest altitudes to the highest.

Altitude by varietal

One of the most interesting findings in all of the data we collected and analyzed was that improvements due to altitude were much stronger when certain varietals were used. This leads us to the conclusion that producers at higher altitudes would benefit even more by switching to the preferred varietals.

Once again, the average improvement (shown above) for higher altitudes was just over 2 points.

The next graph shows what that improvement looked like when we limit the analysis to just limaní, fronton, and catimor (three low-scoring varietals):

We can observe the same general upward trend that we saw in the comprehensive data set. However, if we read the graph closely, we can observe that the improvement is much less dramatic. In fact, there is barely 1 point of quality improvement in over 2000 feet of altitude increase. Producers who plant these varietals (fronton, limani, and catimor) at high altitude are not receiving the full benefit of their natural altitude advantage.

Let us now contrast this with the data from a different subset, using the high-scoring varietals pacas, bourbon, and caturra.

Once again, we see the expected increase in quality as altitude increases. However, in this case, the increase is far more dramatic. The low-altitude coffees score just above 80 points. But the high-altitude coffees are nearly at 84. That is nearly a 4 point gain in cup quality due to altitude, the kind of quality gains that tend to bring much higher prices in the specialty market.

Producers who are planting pacas, bourbon, and caturra at high altitude are getting a much better return on the natural advantage of high altitude.

Conclusion: As we saw in the first section, all coffee producers can expect an increase in quality by switching to higher-quality varietals. However, this switch is even more crucial for higher altitude producers. The higher the altitude, the more benefit producers can see from using these better varietals. Producers who plant lower quality varietals at higher altitudes are missing out on the huge benefit that altitude can provide.

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More to come...

Ethiopia Buying Guide Available Now

The buying guide I was working on for Ethiopian coffee, under the aegis of the USAID-ATEP project there, is finally finished.

We are printing up about a hundred coffees to take to the SCAA show in Houston at the end of the month. In the meantime, people can get access this document online here. This is a very big file and will take a couple minutes to load, even with a fast connection. Or you can download the pdf file by right-clicking the link.

This is a complete guide to understanding Ethiopian coffee, from production, to processing, to buying and selling. It includes phone numbers and emails of all the major cooperative unions and exporters, logistical information about buying Ethiopian coffee (and coffee in general). It even has an extended section showing the morphology of different coffee beans from different regions of Ethiopia (with astonishing high-resolution pictures).

I'll post some of the most interesting pictures and information here on the blog, but if you want to take a free master class on understanding how coffee really works, I recommend you download a copy for yourself.

Panama Course: Crafting Quality at Origin

I just want to give a heads up to those of you that follow this blog: I'm teaching a course in Panama in March of 2011.

This is for folks who are damn serious about their coffee businesses and their coffee careers. The world's most unique coffee education course, among the coffee farms and cloud forests of Panama. A truly unforgettable learning experience that will launch you into the next level (and possibly several more levels beyond that).

This course is five days of intensive coffee education amid the splendor of coffee farms growing along a nature preserve in the volcanic cloud forests of Panama. It's as beautiful as it sounds.

And by the way, March is absolutely the month you want to be in the mountains of Panama. Warm and sunny without being humid. Cool breezes among the trees and mountainsides... it's paradise. The farm we are staying at is surrounded by nature preserves, and serves as a stopover for dozens of different tropical and migratory birds. In fact, they get annual groups of ornithologists that come and stay in these cabins.

But this is no idle sightseeing trip. We'll be studying intensively the workings of a coffee farm, with a special eye towards how quality is crafted. Course topics include:

• • Introduction to Sensory Analysis
• • Intensive Tasting Exercises
• • Coffee Tasting Training and Triangulation
• • Applied Roasting Theory
• • Hands-on Roasting Sessions
• • The Workings of a Coffee Farm
• • Tours of High Altitude Specialty Coffee Farms
• • Theory of Growing Coffee
• • Coffee Processing Up Close and Personal
• • Environmental and Social Sustainability
• • Buying Coffee for Your Business
• • Developing Relationships with Growers

Finally I should mention too that March is the end of the harvest season in Panama. We will have dozens upon dozens of fresh-crop, unsold specialty coffees on site for roasting and cupping. It would be great to see some of you blog-readers in Panama, but space is very limited, of course.

There's a website about the class here. Or you can send me an email to [email protected]

Influence of Soil Type on Coffee Flavor (Video)

Stage one of a long project studying the influence of soil type and weather on coffee flavor profile: on-site in Puerto Rico.

Harvard Says "Drink Coffee"

Normally I try to post my own work here on this blog. I'm not an aggregator, but sometimes stuff comes along that I have to post.

This info-graphic about the health benefits of coffee comes from the Harvard School of Public Health. Be sure to click the little icons on the left to see other fun facts about coffee.

Why do I post this graphic and not the other stuff that people randomly send me? Well, a certain someone I know just happens to be a graduate of Harvard School of Public Health. Plus, you know... coffee.

NYC Women Are Attracted to the Smell of Coffee?

Aww... I thought it was my rugged good looks.

New York Women Seduced By Scent of Coffee, from NBC New York.

(I note that the survey was commissioned by AXE "body grooming" products... please take with generous quantities of salt).

Roast Profiling and Cupping

For the next three days I am in Marin County, California, teaching a class at Boot Coffee Consulting. The course is called Roast Profiling and Cupping. It combines information on sensory analysis, heat-transfer dynamics, and artisan roasting techniques.

The first day of this class begins with, well, coffee of course. Once everyone's acclimated to the lab, where we have several different sample roasters, brewing equipment, an AV set-up, cupping lab, coffee library, etc, we start with a lot of theory. What's the difference between convection, conduction, and radiation when it comes to the development of coffee during the roasting process? How does processing affect the way beans of different densities absorb heat?

Then we dive right into sensory analysis. We do sessions with nuts, dried fruits, chocolates, apples of different acidity levels and sweetness levels, fruits with different kinds of mouthfeel. All this is leading into the really important stuff: the sensory analysis of coffee. Cupping, that is.

We cover cupping vocabulary, cupping protocols, cupping technique, and we do LOTS of triangulation exercises to put people through their paces. And that's all just day one.

Day two and day three involve a lot more theory, but mainly it's about roasting and cupping, and roasting and cupping, and roasting and cupping. I teach or help teach this class several times each year. We have roasters from all over the world come to learn and practice. This class has folks from California, New York, Wisconsin, Seattle, Massachusettes, Australia, and Singapore.

This week we set up a canopy outside because of the heat in Northern California. Students are starting to arrive right now as I type this. Time to go!

Jeremy Explains his Non-burning Afterburner

I'm in California to teach a roasting course and host a cupping. But in the meantime here's a little video from my trip last week to Portland with Sarah Dooley. We were putting on a cupping of Ethiopian coffees for the local specialty coffee roasters. Jeremy Adams of Cellar Door Coffee Roasters was kind enough to let us use his space. After the cupping he showed us his new baby, a Diedrich IR-12 roaster. To cut down on smoke without installing an expensive and carbon-hungry afterburner, Jeremy installed this cool scrubbing system instead.

Check it out... the videos a little shaky, but if you stick around till I get my camera in the right spot, you can see the super-fine particulate mist he's talking about.

First Crack and the Little Firecrackers of Heat

When roasting coffee, the time between first crack and second crack, or first crack and the end of the roast (whichever comes first), is the critical phase that determines the flavor of the coffee. During this time, sugars and other compounds in the coffee bean cells are undergoing Maillard Reactions, which is essentially caramelizing. If you blast through this stage too quickly, the coffee will get burnt without ever developing sweetness. If you don't go far enough into this stage the coffee will be sour and underdeveloped, and lacking sweetness.

Whether you are looking for a light roast or a dark roast, it's absolutely critical that you do what you can to extend the Roast Development time.

The hard part, though, is that right at the first crack, the beginning of roast development, the beans go into an exothermic reaction. Where they had been absorbing heat from the roasting environment, now suddenly they are giving off heat to the environment like little exploding firecrackers. This raises the overall temperature of the environment, and tends to make whip you right through the Roast Development time faster than you wanted.

In order to compensate for this moment, anticipating the beginning of the first crack, it's a good idea for a roaster to back off the heat supply of the machine coasting into the first crack just right.

There's a lot more to it than that, of course. But that gives you an idea of the kind of thing we are talking about in my course this week.