Coffee

Crop to Cup – Part 4

/ Pete Denison / Leave a comment

The fourth instalment in this Crop to Cup series looks at the final steps of processing, followed by the roasting of our “microlot” of coffee, kindly received straight off the tree from a barista friend about a month ago. As with anything, good things come to those who wait, and four weeks after starting, we are almost to the point of tasting the fruits of our labour.

To date, we have worked our way through Pulping, Fermentation (Crop to Cup – Part 1), Drying (Crop to Cup – Part 2), Drying again (yep – it took a while) (Crop to Cup – Part 3), and we continue on below.

4. Parchment Removal (Hulling)

In Part 3 of this series, drying continued in preparation for the final “hulling” or parchment removal prior to roasting. After a further two weeks drying (four in total) it was time to remove the parchment layer.

As I have written in previous posts, the beans being “dry enough” and the parchment ready for removal, is determined both by observing an appropriate drying time (approximately two weeks to a month), and having the parchment split easily off the inner bean upon attempted removal. According to the Department of Agriculture, Fisheries and Forestry (DAFF):

Inadequate drying – greater than 12 per cent moisture – will cause mouldiness and stale aroma during storage.

Upon proceeding with the hulling by hand (or rather thumbnail and finger), it is clear this is quite a labour intensive undertaking. After 1 hour, the parchment layer was removed from our crop, and we were a step further along in the process.

Photo 13-10-2013 5 41 17 am

Given the time and labour intensive nature of this part in the process, the DAFF suggests the following:

Place the beans, a small quantity at a time, in a food processor or similar type of blender. Use plastic blades to avoid breaking the coffee beans. Blend at low speed for approximately 30 seconds to remove the parchment from the beans.

My mother uses a similar approach, blending on low-speed for 8–9 seconds, which she finds removes much of the parchment layer without damaging the green bean inside. Whether done by hand or machine, you will be left with a fine outer layer of “silver skin” remaining on much of the bean. Enlisting the assistance of my son to provide a quick rubbing of the beans between his hands removed this final layer. Blowing away any remaining silver skin completes the process.

Photo 13-10-2013 5 47 51 am

We were now ready for roasting!

5. Roasting

With a dry weight of 35 grams, there was certainly no margin for error, and had me thinking I really should be calling this a “nanolot”, as “micro” probably doesn’t go far enough (yes an hour of hulling for 35 grams of green beans – as I said – very labour intensive!).

So proceed with care I did.

Photo 13-10-2013 6 01 02 am

The roast was undertaken via my usual breadmaker / heat gun set up which I have previously written about. The heat ramp was very slow, and the total roast time 12 minutes, with the beans pulled out 3 minutes after first crack. The result looked like a pretty even roast, and was cooled and bagged. A few days rest and it will be ready for tasting.

Photo 13-10-2013 6 07 14 am

Check back soon for the much anticipated taste test!

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Crop to Cup – Part 3

/ Pete Denison / 1 Comment

photo (4)

Continued from Crop to Cup Part 1 and Part 2

If you have been reading this series of posts to date, you will know that for my wet processed micro lot I am following the steps listed below:

  1. Pulping
  2. Fermentation
  3. Drying
  4. Parchment removal (hulling)
  5. Roasting

The first two stages were outlined in Parts 1 and 2 of this series, along with the initial phase of stage 3, in which today we learn that patience is indeed a virtue.

3. Drying continued

Every day I walk past my drying rack, checking (and turning) the beans, as the remaining moisture is drawn out, courtesy of the great weather we have been having of late in South East QLD. No rain to speak of (though many gardens need it), and fairly low humidity (compared to usual levels) have made for what I would consider perfect ‘bean drying’ weather. Although the beans have been undercover and would not be directly affected by rain, the increased humidity and overall moisture in the air would likely have required a longer period of drying.

The ideal drying time?

For further information here we again refer to our two main sources:

The Department of Agriculture, Forestry and Fisheries (DAFF)

Whichever method of drying you use, the parchment on the coffee bean will dry to a pale straw colour and be brittle to touch. At this stage, test the dryness of the beans by removing the parchment by hand off several coffee beans. If dry, the bean inside should be greyish blue in colour, hard, and likely to break when bitten between the teeth, if not soft and chewy. If soft, continue the drying process.

The ‘methods’ of drying referred to above include the natural sun drying method I am following, or alternatively, a food dehydrator, which must be kept at 40 degrees celsius over the course of several days to complete the drying. Whilst a dehydrator may be a more rapid method of drying, some of the romance is lost, if I imagine hundreds of square metres of beans drying in the sun on a Colombian hillside. Though the strength of this argument wanes a little when my entire crop fits into my palms cupped together.

Anyway, for the current crop, sun drying it shall be.

My Mother

I usually leave it at least two weeks to dry out. Sometimes you might get away with 10 days or so, but two weeks just to be safe. Your best guide is to crack off the parchment layer with your thumbnail, and if you get a good split or cracking noise you can be fairly sure it is dry enough. Once I have removed this layer and simply have the green bean, a couple of days more drying will really finish them off.

We agreed that my planned two further weeks (making four in total) drying time would not be to the detriment of the end result (that is, be too long). The four week time frame is due to a holiday occurring in the middle of this process , rather than specifically planning a drying time of this length. I do note however this does coincide with the upper end of the 5–30 day recommendations of the DAFF.

Drying – Two Weeks In
As noted above, after two weeks I am now half way through my planned drying time and testing a couple of the beans would appear to show that everything is on track. You will see in the picture below that that the outer parchment is quite dry (it also comes away from the inner bean with a nice crack when pressure from my thumb is applied).

photo (5)

Referring to the DAFF instructions above, the bean is blue/grey in colour and feels reasonably hard, though I did not see the need to give it the ‘bite test’. In another two weeks I would expect the beans will be well and truly dry and begging to be roasted, at which time I will provide an update with another post.

In the mean time, have a look at my magazine Brew – Ways of Coffee on Flipboard for some great articles I have collected from around the web.

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What’s Roasting #5 – Ethiopian Yirgacheffe and El Salvador Siberia

/ Pete Denison / Leave a comment
Ethiopian woman coffee farmer with basket of c...

Ethiopian coffee farmer (Photo credit: Wikipedia)

After aiming my recent roasting efforts towards blending, it’s time to get back to some of my favourite regions and sample some single origins. I will also post a further update in the Crop to Cup series in the near future, as we get closer to roasting and sampling.

So, in searching for a fruity African varietal, this Ethiopian Yirgacheffe came along through the good folks at Ministry Grounds, who also supplied the following roasting advice on this coffee:

Go easy on the heat early on, allowing a gentle drying period. But build some momentum up to the start of first crack. When the beans go exothermic, expect a temp rate drop and try and anticipate this. Not letting the rate rise drop too much will develop the sugars and fruit flavours fully. Don’t go near second crack!

Vista panorámica de la ciudad de Santa Ana (El...

Santa Ana (El Salvador) (Photo credit: Wikipedia)

At the same time I stumbled across a Central American variety in the form of the El Salvador Siberia Pacamara which placed 20th in the 2012 Cup of Excellence, and certainly read well in terms of its potential out of the roaster and into the cup:

Floral with green apple, pineapple and black cherry. Lovely honeycomb and sugarcane sweetness. A balanced cup.

I am looking forward to seeing whether the El Salvador lives up to the usual crispness of varieties from the Central American region, and likewise the usual blueberry explosion of the Yirgacheffe. Tasting review to follow soon.

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Crop to Cup – Part 2

/ Pete Denison / 3 Comments
Coffee drying in the sun. Dolka Plantation Cos...

Coffee drying in the sun. Dolka Plantation Costa Rica (Photo credit: Wikipedia)

Continued from Crop to Cup Part 1.

With the fermentation phase now complete, we move on to the drying phase of processing. You may remember from the first part of this series, coffee processing is broken up into the following stages, as described by both the Queensland Department of Agriculture, Fisheries and Forestry, and my mother, who is very experienced and knowledgeable in these matters:

  1. Pulping
  2. Fermentation
  3. Drying
  4. Parchment removal (hulling)
  5. Roasting
  6. Grinding, strong and brewing

At the completion of Crop to Cup Part 1, we left the beans fermenting in water at stage 2 above. I was a little unsure of how long this may take (72 hours or up to a week), though armed with the knowledge this phase would be complete when the mucilage (slippery outer layer) was easily rubbed away. Daily testing was undertaken, until on day 7 (exactly as predicted by my mother), rubbing one of the beans between thumb and finger resulted in a slightly gritty/pebbly feel rather than a slippery one. Time then to move onto drying.

3. Drying
Once the beans have fermented for long enough, they are required to undergo a final wash and rinse, before being laid out on drying beds. In aid of passing down the coffee loving tradition to the next generation, my son was enlisted to rub off the mucilage, with repeated washes then performed to remove any remaining on the outside of the bean. Agitating the beans and replacing the water over three washes was sufficient to achieve this.

Washing

Looking back to our Department of Agriculture guide, the drying process is described as follows:

The beans should be spread out in a thin layer no more than 3 cm thick, stirred three times a day, and be protected from rainy weather. Drying in this way can take 5–30 days, depending on the seasonal weather pattern.

As you can see below, an initial drying of the beans was done on a small towel, before transfer to a drying rack to allow plenty of airflow around the beans. The rack is situated under cover to avoid any weather or dew, however sees the mid to late afternoon sun, which should assist with drying. Given the small crop I am processing, a single layer of beans was placed on the drying bed, with little chance of any mould formation (the reason for stirring daily), though I aim to ensure the beans is are turned regularly.

Drying

I hope you will join me in a couple of weeks for the next post in this series, where we will be up to removing the remaining parchment layer and roasting our crop!

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What’s Brewing #5 – Indonesian Aceh Gayo

/ Pete Denison / 1 Comment
Young boy in Guel dance, Gayo country, Aceh pr...

(Photo credit: Wikipedia)

It’s nice to review a coffee produced “locally” here in the Asia-Pacific region. This Indonesian Aceh Gayo Gr1 Organic was originally roasted to go in my Three Bean blend (see What’s Brewing #4), however I was obviously keen to assess it as an origin in its own right. Living here in Australia, there are a number of smaller coffee producing countries in the region, however most of my experience has been with those originating in New Guinea. Lets see how this one stacks up.

(Right: Young boy in Guel dance, Gayo country, Aceh province, Sumatra, Indonesia)

The Whack

What: Indonesian Aceh Gayo Gr1 Organic

* Origin: Gayo Megah Berseri estate in the Central Aceh region of Sumatra
* Altitude: 1400–1600 metres
* Processing: Semi washed, sun dried
* Harvest: March 2013

How: Latte, Aeropress, V60

Assessment:
Dry Aroma – Probably best described as spicy/herby with floral notes, mingled with brown sugar

Latte – Does surprisingly well through milk. I would not say there is a lot of body, though definitely enough to give it some punch, carry through the chocolatey undertones and floral notes. Performed better than expected here.

Aeropress – Very well suited to this form of brewing, possibly even shading the V60 in allowing the herb and floral flavours to come to the fore. Made me think a little of dandelion. The only negative here is it probably lacks a little sweetness.

V60 – Smooth, very smooth. Shows more sweetness than the Aeropress however a little less of the herbal and floral notes. The medium body and a crisp finish make this a very enjoyable brew overall.

Conclusion; Know this:
Though assessed across the three methods above, you may note no Espresso. No conspiracy here, I have simply been playing with the V60 a little more (or a lot judging by the dwindling filters), having only purchased this a couple of weeks ago. I had high hopes for this variety given it is a “local”, and certainly was not disappointed. This is one of the best all rounders across the different brewing methods I have had in recent times, and would highly recommend this either on its own or in a [blend](What’s Brewing #4).

Overall rating: 4.5/5

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