[m-p-3]

> For filter coffee, however, the ultrasound-brewed version performed even better: participants significantly preferred it overall, particularly rating its bitterness as more pleasant.

I'm surprised by this, my assumption from hot coffee vs cold brew was that since the water isn't hot, there wouldn't be as much bitterness? Or maybe I'm reading it wrong and it's why they prefer it, because it's less bitter?

[petre]

Then just get a lighter roast and don't over extract? Also if it's espresso get rid of the crema. Looks geat, tastes awfully bitter.