Serra do Bone Naked a photo by Lameen on Flickr.
I could easily have updated my last post but decided not to. In any case, JUST ONE MORE THING ABOUT Serra do Bone @ Home, which really applies to making coffee at home. I have to confess, all those years that I was making coffee at home I never measured the weight of my coffee before putting it through the grinder and extracting espresso. There are many reasons for this, which in a nutshell can be described as, that I just assumed that as long as I ground enough to fill the double basket and as long as I got about 25ml espresso in 22-25 seconds and there were nice tasting notes at the end, Voila ! it was right. Well ! WRONG – well ! that’s a bit harsh – not exactly true is closer to the final judgement. WHY ? Here we go…
1. Too much coffee doesn’t mean a better taste: We often assume that the more coffee you get into the porta filter the stronger the coffee and hence the taste. This isn’t true. Sure you may get more coffee and perhaps more caffeine, BUT not a better taste, because we now know that the coffee can taste better with lower weights, especially milk-based espresso, i.e. cappuccinos.
2. How much coffee should we use ? There’s a sort of standard agreement that espresso is made using 7 grammes of coffee, and so a double shot, should be 14 grammes, right ? Well ! not exactly. There are many parameters that affect the taste and now, some say between 18-22 grammes. So, initially I thought that at escape caffe, we would go for 20-22 grammes of coffee, so that all that milk would not drown out the taste of the coffee. However, after about a few weeks and consulting with my roaster, we realized that by reducing the weight to just under 20 grammes, we could get a better taste profile.
3. What’s the right grind ? Higher weights of coffee can mask/hide the right grind for the coffee you are using, HOW ? If you use a lot of coffee, you have to grind coarser to make sure it goes through the portafilter, because remember, that the finer the grind, the harder it would be to get through the portafilter when extracting espresso. Still with me ? BUT, if we use less coffee, we don’t have to grind so coarse. I noticed that when we were grinding the coffee, we had lots of clumps of coffee, which meant we were grinding lots and the heat of the grinder (which are programmed) was making the coffee clump together. So when we reduced the weight of the coffee to about 19 grammes, we didn’t see so much “clumping”.
All the above arguements have been discussed at great length on twitter by experts such as James Hoffman (aka Jim Seven blog), Mark Prince (aka Coffeegeek) and Intelligentsia from which I have learnt a lot about weight profiles. So, you’ll see that people weigh the beans before grinding, weigh the actual extraction liquid, across different temperatures and times and then get a ratio. In summary, you can get different taste profiles depending on the weight, time and temperature – Complicated ? Well ! yes it is, but who said that “real” espresso was easy.
One final thing is pre-infusion – a big word, but it really means that you run water through the group head before extracting your espresso – without portafilter of course. What does this do ? Well for my home espresso machine, which doesn’t have a PID (temperature control mechanism), it will lower the temperature and should make it ready for extraction – that’s the theory at least, but it’s been working for me at home, so complaints there.
OK ! so finally, when I made serra do bone at home, what did I do ? Apart from following the rules, I kinda measured the beans before extraction (I use my eyes because of experience at the caffe), pre-infuse for 5 seconds to lower the temperature to below 94C and extract in about 23 seconds and there’s definitely a difference in taste.
The first thing is more body in the coffee, but strangely enough a good taste profile, even though the beans were roasted over 22 days ago (we don’t serve coffee using beans roasted over 21 days ago, so I bring old beans home).