Indonesia Raja Batak

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Measuring setup. Filters & alcohol swipes & pipettes, centrifuge tubes & stoppers, refractometer, espresso, fountain pen, notepad, distilled water dispenser, Amprobe temperature meter, Tonino color analyzer for coffee grinds, scale, Indonesia Raja Batak beans.
Pulled, tasted and measured three espressos from Indonesia Raja Batak beans roasted 13 days ago, Tonino # 93 today.

All three with 20g beans, from the HG One grinder in the VST 20g basket. Used the flat tamper to measure the Tonino value but the convex tamper before the extractions as I get a more even flow then, mostly. 

Extractions were 30.3g, 30.5g and 30.3g (first second and third pull).

I used the same centrifuge program for all three 7g samples taken from the espresso shots.

The first measured 10.4% TDS = 16.3% extraction, and tasted nice but a bit thin for these beans which can be beautifully complex spicy.

With a bit finer grind, the next measured 10.9% TDS = 17.11% extraction, tasting great, a very pleasant mouthfeel although I have had more of a wealth of taste from these beans a while ago.

The third shot with a little finer grind still (about as much finer as the first turn on the grinder) measured 10.8% TDS = 16.96% extraction and the taste had a slight dryness now.

It surprised me that the finer grind did not create a larger yield. Possibly the fines now clogged up the flow besides allowing more extraction, but there may be lots of other things I haven't considered yet.

Next time I taste a dryness, I will try a slightly coarser grind and a shorter shot.




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