Advanced sorting/culling coffee beans

[hbuchtel]

I am intrigued by the mention in Two days at Terroir of the hand-sorting that they do before roasting and had a couple questions about the practice-

The greens that they get there are presumedly pretty well sorted already, at this point is the goal to remove 'defective' beans or rather to create a more uniform taste?

I assume that there are some characteristics which would lead to slightly different flavors, without being considered defective- an obvious example would be peaberry vs whole (half) beans. Perhaps they are looking for other things like slight variations in size/color?

Do any of the roasters here find hand sorting worth their time?

Henry

[coffee_monkey]

The greens that they get there are presumedly pretty well sorted already, at this point is the goal to remove 'defective' beans or rather to create a more uniform taste?

I assume that there are some characteristics which would lead to slightly different flavors, without being considered defective- an obvious example would be peaberry vs whole (half) beans. Perhaps they are looking for other things like slight variations in size/color?

Do any of the roasters here find hand sorting worth their time?

Henry

Gravity sorter and electronic eyes can't catch all the defects. The "minor" ones are especially hard to sort - under ripes and agey greens (they turn white-ish/spotty white). All these contributed some off flavors to the cup... removing them resulted in a cup that is incredibly clean, sweet, and "focused". The major flavor component of the cup is very defined.

I've been sorting since the concept was introduced us by Simon Hsieh, a Taiwanese roaster who sells "zero-defect" coffee. A lot of Japanese and Taiwanese roasters also hand sorts greens for production roasts (though not to the extent/standard of Simon's roasts). I highly encourage everyone give it a try. It will teach you a lot about green quality, and prob will shock you with the amount of defects in those "specialty grade" coffee...

- Ben C.

[SL28ave]

Everyone should play around with this, at least to learn. It's so easy to do to some extent.

George first learned about it at La Minita around 1990. Bill Mcalpin, legendary owner of La Minita, was pointing to different beans from the same farm and describing how they taste. There were sorting exercises at The Coffee Connection and further learnings from Brazil during the Gourmet Project. George used this to help with grading at Cup of Excellence. I spent countless hours hand-sorting different specialty grade coffees at Terroir over 3 years ago - and the cuppings from this are definitely amongst my most powerful coffee lessons ever. Learning to sort and learn from the results is so very empowering!

Pre-roast, I pull out any unripes, tiny, pale, dark, splotchy, mutant-shaped, triage, bruised, cut, hard-pressed, over-ripe or moldy beans that I can find. Additional sorting can be done post-roast, especially when lightly roasted: bite different-looking beans to learn if they smell mellow, roasty, sewery, peanuty, or *great*.

Mud can be turned into molasses or even better. Coffee-Monkey said it very well: "removing them resulted in a cup that is incredibly clean, sweet, and "focused". The major flavor component of the cup is very defined."

[DaveC]

I have also always pulled out any obviously defective beans before roasting (I don't go mad about it, but I have a reasonable look). After roasting I definitely go through all the beans carefully. Although I have magnets in the roaster, I am looking for quakers and other roast/bean defects, plus stones and non ferrous metals etc.

I think the taste in the cup can be markedly improved when the beans have a little sorting done pre and post roast (in a roast just for me, I might spend even more time sorting in the pre-roast stage). The whole topic has made me think though, and I realise that I need to write a small Wiki article, as many home roasters possibly don't do this and could benefit greatly if they do.

[SL28ave]

For those of you who may have anti-sorting at home feelings, you very unexpectedly won a battle (small in the big picture, but absolutely essential) last week, but not the war!

I sorted a couple super Colombian lots into <16, 16, 17 and 18+ screen sizes and cupped them. Basically, the results of the cupping were as if the beans were yelling, "try sorting, and the flavor will defy!". A true-blue expert guest from Colombia was present and said something along the lines of, sorting by size "is like saying you're smarter than me because you're taller" (George is taller, FWINW)... Aye, coffee is complex.

[farmroast]

Peter You would have to trace each bean back to it's tree and branch to determine why the bean ended up larger or smaller. Maturity,part of the bush, water, nutrients, general health, exposure. It would be really interesting to pick by different criteria within a grove. When I go to a pick your own apple orchard I'll pick from sunnyside of a healthy tree that stands in a spot that can collect ground water.

[Pilgrim]

I am intrigued by the mention in Two days at Terroir of the hand-sorting that they do before roasting and had a couple questions about the practice-

The greens that they get there are presumedly pretty well sorted already, at this point is the goal to remove 'defective' beans or rather to create a more uniform taste?

I assume that there are some characteristics which would lead to slightly different flavors, without being considered defective- an obvious example would be peaberry vs whole (half) beans. Perhaps they are looking for other things like slight variations in size/color?

Do any of the roasters here find hand sorting worth their time?

Henry

The short answer is: YES

I have found bugs and rocks in my green beans before! The rocks are hell on a expensive grinder and its burrs and the bug can ruin a hole batch of roasted beans by throwing off the flavor and the damn thing looked just like a coffee bean! So it pays to go through a pound of beans for a few minute's inspecting them in a flat metal sive is what i use an old baking sive 10" i bought off ebay and used to cool beans at one time works great under strong light to do the inspection in. You have to remember that the people that inspect them before you go through 100's of pounds of beans at a crack so being human bound to miss some things

[ordo.dk]

I've started to hand sort my beans pre-roast. Usually I only cull 10%, today however I took out 18% of the greens - oh, and I found a ROCK :( I like to believe that I can taste the difference in the cup, not because of the missing rocks, but some of the beans I remove are disgusting looking, I cannot believe they wouldn't affect the taste!
Only minus is that it takes a while to sort them :P