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Techniques - Watching what's being poured? No scientfc gadj.

Beginner or pro barista, all are invited to share.

Link to "Techniques - Watching what's being poured? No scientfc gadj."by buzzmc on Wed Jan 18, 2006 12:54 am

OK, I'll full on admit I'm a newbie in just about every respect of the word, except that I've been drinking arguably really bad coffee, and definitely really bad espresso for years :shock: ... So if this doesn't make sense I sincerely apologize in advance.

Also note that I need to go to keplers or b&k and pick up a couple books that have been recommended. All that aside, let me get on with what I was trying to say with that title.

In a nutshell I'm trying to ascertain how realistic it is to look at what's being pulled, and taste it, and come up with conclusions. Throw out all the measurements, pressures, temps, what beans, etc. For arguments sake though lets state that beans are fresh, ground when needed, so the whole old/stale beans thing is out the window.

I've just finished reading how malachi tests a new coffee. First and foremost I never knew anyone would go through something so thorough, let alone that this might actually be expected of a top/talented barista. It's daunting to say the least, but I also imagine that this wouldn't be "expected" practice for the home barista, except for the most fanatical/obsessed folks.

So my point is how do we simplify the task? Can we indeed just look at what we produce and make adjustments accordingly? Please note that what I'm about to type next is just an example, I have *no* knowledge of any of the things being correct, and one should assume they are incorrect.

If you get a watery cup, maybe you had too little coffee, too loose a tamp, too loose a grind.
If you get very little volume maybe you used too fine a grind, too tight a tamp.
If you get very little/no crema, maybe there wasn't enough pressure...

The list goes on... This is still a fairly daunting task, no doubt. I'm just barely scratching the surface... But would this be an acceptable way to learn? Systematically changing *one* thing at a time, instead of 2-3, so you can actually see what happens when you make a change.

Lastly, and this is probably just as important... Where do you go for a good espresso? We all know we can't go to Peets or Starbucks... And I'm sure there are thousands of "mom and pop" shops that are different from Starbucks, but also still produce really bad espresso. Malachi points out that many of us home barista's "lower the bar" for what is acceptable, which if that's what you like to drink (or more likely learned to like to drink), that's fine. But I think I echo all of our thoughts that none of us wants acceptable espresso, we want excellence.

-bryan
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Link to "Techniques - Watching what's being poured? No scientfc gadj."by another_jim on Wed Jan 18, 2006 2:01 am

It's called "espresso diagnostics." You watch the pour, look at the crema, and taste the shot carefully; then depending on what you sense, you adjust the shot to improve it (or just get another taste balance). This is probably the only way, certainly the best, for getting the most out of new coffee on your machine, whatever it is.

With a lot of Chris's (Malachi's) and other's help, I wrote down a set of espresso diagnostics in the home barista guide:
http://www.home-barista.com/espresso-guide-skills.html

Measurements of temperature, pressure, time, etc on an espresso machine are not done for the purpose of improving the taste after one has had a poor shot. Instead, they are done for two reasons: to adjust the machine and its operating procedures to its best performance, and to compare different machines or components to each other to see which performs better or more precisely. The purpose of all the measurements is to find a machine and tune it to the point where you can reliably make the adjustments called for by the shot diagnoses. It's easy to miss this main point in the discussions on measurement, because they've gotten into the nitty-gritty details of finding the best measurement technique, and rarely refer to the ultimate point of the measurements.
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Link to "Techniques - Watching what's being poured? No scientfc gadj."by mrgnomer on Sat Jan 21, 2006 4:36 pm

Hi bryan,

As a newbie as well the process of pulling a good shot, let alone a great shot, is daunting.

What's maddening is pulling great shots from a blend one day or several days in a row then having no luck later. Raising the top of your espresso pulling bar and then not being able to come back to it is a bummer.

It all seems to be about hitting a sweet spot with all the variables: water temp, grind, dose, distribution, tamp, pump pressure. Get them all in the ideal range and the espresso'll be really good, even great. With different espresso blends being pulled best at different water temps, grind being sensitive to environmental conditions, dose and distribution vital to even, full extraction there's a lot of factors that come together for a great shot.

It looks like the experience gained through knowledge, practice and intuition is what allows a barista to zero in on adjusting the variables that will lead to a great shot.

I agree with you about watching the shot pour. It's essential in monitoring and diagnosing technique.

Definitively it's taste that rules and as far a I understand it great taste comes from good even extraction.
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Link to "Techniques - Watching what's being poured? No scientfc gadj."by buzzmc on Mon Jan 23, 2006 1:50 am

About a 3rd the way down on this thread:

Problems with Fast Shot Extraction

Cannonfodder posts two pictures... One with a "light" short crema head to the shot, and another with the cup mostly filled with crema.

As noted old beans apparently account for this most often, but what if you're using fresh beans in the one-week old range, from a known good roaster and get the light/thin head result? What might some of the other culprits be?

Cannonfodder's first picture is picture perfect of most of the shots I've pulled, and I haven't been able to figure out a way to get away from that.
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Link to "Techniques - Watching what's being poured? No scientfc gadj."by kbuzbee on Wed Jan 25, 2006 2:25 pm

buzzmc wrote:As noted old beans apparently account for this most often, but what if you're using fresh beans in the one-week old range, from a known good roaster and get the light/thin head result? What might some of the other culprits be?


You'll find most of the culprits here (and have discussed most of them).

I use a Zassenhaus grinder with very sharp burrs which gives me a very even grind. I'm adjusting this constantly though as the coffee gets older, humidty changes etc

I grind (relatively) course, distribute with the base of my thumb and tamp the heck out of it.

Keep the portafilter and your glasses warm/hot. I use a pan of hot water on the stove.

I preinfuse for a couple seconds and pull straight down, or if I've intentionally over dosed, I'll bring the handle down twice (about two inches each time and let the group refill with water on each rise)

I never get less than 3/4 crema (varies by coffee, age etc) and usually much higher than that.

Keep working it. You'll get it

Ken
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Link to "Techniques - Watching what's being poured? No scientfc gadj."by Rosemary on Thu Jan 26, 2006 4:36 am

I read the espresso guide that Jim referred to. It is fantastic and so detailed so when I get my hands on a coffee machine again I will be trying lots of things. The timing of shots (20 - 25 secs) is oftened mentioned when discussing techniques. Does preinfusion where the pressure is lower at the initial part of the shot vary the timing recommended or does the preinfusion with the "timed stopping of the pump" (clumsy description) as in the La Marzocco effect it?
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