Coffee science time!

@PilotCoffee Heritage, 18.0g in at 1.70 on the grinder... BUT this time there's a twist.

https://www.home-barista.com/espresso-machines/aeropress-filter-below-and-above-puck-t58544.html

...(grind, groom, tamp; but that's something different under the grounds, stay tuned)...

...we're going with the Rao over/under filter trick to try to increase extraction a bit.

When I had espresso made this way in the past (by an actual pro, not me) it kind of... Soft-focused the flavours a bit. Muted good blends sometimes but made single origins more approachable.

92°C, 36.6g out in ~45s. (I'm a bad coffee scientist because I changed two variables at once this time: I used the @thirdwavewater Brew formula instead of Toronto tap water. Cf. https://www.toronto.ca/services-payments/water-environment/tap-water-in-toronto/tap-water-quality-system-reports/ )

Notice the absence of tiger striping / mottling and the extra spray!

Rather a lot of extra spray, in fact. Bit of a messier puck knock-out than usual, but I think that's just because I expected to have to knock it out as usual and instead it just slid out, so I messed it up a bit.

Surprising how much coffee ended up above the top filter! Huh.

As for flavour results, the extra filters seemed to do this time what they've done previously: knock the sharp edges off the flavours a bit and blend it all together.

The Heritage beans didn't really need that help, but I'll try this with the Das Nascentes next time and see!

Full disclosure: two-coffee morning, not because the espresso was dissatisfying but just because I felt like indulging a bit.

(tagging in @syncros to this thread for obvious reasons! )