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Given a choice between using a good coffee grinder a few days in advance, or one of those whirly-chopper grinders immediately before brewing, which would you choose?

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I'm not an expert, but it probably depends on how you're brewing it. –  user5561 Aug 29 '13 at 3:17

6 Answers 6

up vote 6 down vote accepted

It's really going to be a trade off between the flavor defects, but it also depends on the brewing method, and if it's drip or espresso.

For us, with drip, stale coffee tastes worse than badly ground coffee. We can always tell if coffee has been freshly ground or not, because the characteristics and flavor profile change the longer it's been ground. Having a crappy grinder will affect the flavor as well, with some grounds being over extracted and under extracted. At this point the quality of the coffee wouldn't even matter.

So, it really depends on what you'd prefer to sacrifice. For me? In this situation, I'd probably just drink tea.

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It will be drip, through a cheap drip grinder with a gold mesh basket. If I'd had time to think before packing for this trip, I'd have brought my own grinder and Chemex. Well, I guess we'll just have to rough it. #firstworldproblems. –  Edward Falk Aug 29 '13 at 19:08

Both have downsides:

  • Coffee that is ground more than a few hours before brewing loses aroma, which is obviously an important part of flavour.
  • A blade grinder doesn't produce evenly-sized particles; big particles will under-extract (losing flavour) and small particles will over-extract (introducing bitterness).

My wife and friends didn't believe me about the over-extraction potential of blade ground coffee, so we did a blind taste test between coffee beans ground with a blade and ground with a burr. I identified the blade-ground coffee every time. That's not the comparison you have, but in the absence of a burr grinder I'd go for pre-ground, for convenience.

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Although there are trade-offs for both, I would suggest grinding right before brewing.

Here is why:

As soon as you grind coffee beans, they begin to lose aroma and flavor. This begins to happen as soon as the beans are ground. In my opinion, this is a big problem if you want really great tasting coffee.

Although blade grinders do tend to produce some uneven particles, which can cause uneven extraction (over extraction for smaller particles and under extraction for larger particles), for the everyday cup of coffee, this isn't a significant problem. Good blade grinders ($50 and up) do not have this problem as much.

The everyday coffee drinker will most likely notice less fresh coffee as opposed to an uneven extraction.

A burr grinder is the best way to go, but you need a really good quality one (expensive) to produce a good grind, and there are even downsides to this type of grinder.

In my cafe, we use industrial burr grinders that are very consistent. At home, I use a good quality blade grinder and usually come up with good results, especially if I am grinding more coarsely (drip coffee, french press, etc). I only really get problems with inconsistent grind when grinding finely for espresso. I also find that if you shake the blade grinder (almost like a martini shaker), the grinds mix better during the process and you get more consistency. That is just what I have found though, and you should be very careful when doing this.

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In my experience it seems to make a weaker brew when ground unless you use more in the pot. Im not a fan of weak coffee so i jus tstick to a good brand of pre ground.

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Hello. Welcome to Seasoned Advice! Are you saying that you feel coffee you grind at home is not as strong as coffee you purchase pre-ground? –  Preston Fitzgerald May 27 at 11:14

Given that both have pros and cons, I would choose fresh ground with a blade over older burr-ground. The smell is an indication of how it will taste, and it smells sooo good immediately after grinding.

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Typically coffee beans are ground to make brewed coffee (hot or cold). If you have a great smell while grinding, you have just lost a lot of the flavour compounds you probably want for the brewing process? –  TFD May 19 at 10:16
    
@TFD That's actually an interesting point, but are you saying burr-grinders don't produce fresh grounds that smell as strong? –  Shawn Taylor Jun 3 at 6:29

I don't think that freshly ground coffee tastes better than pre-ground coffee of the same age? Personally, I cannot tell the difference. So, from my point of view, it's not important at all.

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Just because you can't tell the difference, it doesn't mean that it isn't there. Anyway, demanding evidence is not an answer, it is repeating the question at best. I'll remove that part and leave the rest, so other people reading it are aware that this situation exists - it is not always possible to tell the difference. –  rumtscho yesterday

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