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When pulling a shot of espresso, how long is its life before it is too bitter?

I know this might change by the bean, but what is a rough estimate?

I was doing some coffee tasting and some of the shots were left unused for about 5 minutes and the barista said that these shots were now "dead" and that they don't reflect what the true taste of the coffee is.

Do I really only have 5 minutes to drink espresso before its no longer drinkable?

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It's quite possible that you'd be more stringent about these things in a taste comparison so that you don't compare a fresh shot from an older one. They're just trying to minimize variables that might influence the results; it doesn't mean that it's undrinkable after that time period. –  Joe Dec 26 '12 at 18:35
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5 Answers

up vote 7 down vote accepted

This barista says no, you can enjoy your shot for a little while:

In reality, there are only a couple of things that happen to espresso over the course of a few minutes. First, the crema or foam that sits on top of the espresso reintegrates with the liquid. Crema, on its own, contains some of the best flavors and aromatic qualities of the espresso in high concentrations. Drinking it straight can be overwhelming but, it stands to reason, that having the crema reintegrate might actually be a good thing. Second, the espresso cools down. The temperature of espresso has a lot to do with how we taste the various flavors contained within it...

I am not an espresso fan myself--I like regular coffee, but not after it has cooled down, and never reheated. Many folks are perfectly content to microwave a cold cup and drink it.

I imagine that older, colder espresso is palatable to you to the extent that you are willing to tolerate it. A small shot of coffee--and lets face it, that is all espresso is, even if it is brewed in a fancy manner--is going to cool off much more rapidly than a full cup, or a full pot.

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Let's not face it. Espresso is a small cup of coffee like whiskey is a small cup of beer. (Tangentially / admitedly not relevant to your actual points) –  hunter2 Jun 26 '13 at 7:44
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Espresso starts losing some of its flavour immediately so I'd say drink it within one minute. If made at the right temperature it should be cool enough to drink after a few seconds anyway and after a minute it will start getting too cold to enjoy. I'd also suggest stirring your espresso before drinking to mix the different layers and get a more homogenous drink.

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Shots die after only ten seconds of sitting. You can tell by the change in color. It goes from a nice pretty brown body with a layer of crema on top to a very dark brown/black color. If you have ever done the taste test and tasted both the dead shot and the good shot, especially if you're sensitive to bitter taste, you can absolutely tell the difference. That is why Starbucks stresses a barista not to allow your shot to sit out for longer than those ten seconds.

Barista

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This is correct that coffee flavour alters depended on temperature. However this argument of better is hard to say as its a matter of preference.

For coffee tastings you should try the coffee had a range of temperatures as the flavours alter you may taste something different.

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For me, it is not bitterness or flavor, but temperature. When a shot gets cold, it is not good. So, I would say it could last a couple of minutes, but it is not a sipping drink anyhow. Pull it and drink it.

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