Well, I tried the metal screen on top and paper on the bottom thing again, with:
- Ahlstrom 6020-1250 Qualitative 2.5 micron filter paper, cut with a paper cutter/punch to approximately 58mm
- Normcore metal screen
My dialed in recipe for this decaf full city + bean is 18.0 in, 24.5 out in 40 seconds, including a 20 second bloom pre-infusion. At a 10.5 grind on my NZ. Pressure of 9.5 BAR and temp at 97C. Producing decent body, strength, flavour, complexity and length, for this decaf bean.
With screen and paper, it took an NZ grind of 9.5 to eliminate the sourness caused by the initially too fast flow and associated under extraction. But the body and strength was thinner than before and not to my liking. I also lost a bit of flavour and complexity. I’ve had better shots and drinks.
I then reduced the brew ratio, in increments right down to a very ristretto shot of 18 in, 22 out. I had to reduce the grind (in increments) right down to 7.0, to counter the sourness caused by these short extraction shots. Body was ok, but strength of flavour was not and the shots tasted uninteresting, with no complexity or length.
I’ve poured about 12 inferior tasting shots this week, and am hankering for a decent espresso.
I’m done with this paper and screen faf. Back to the tried and true.