Ground my beans 30 minutes before brewing on a whim and the difference was wild

I usually grind right before I pour hot water over them, like within a minute or two. But last Saturday morning, I ground a batch for my Chemex and then got distracted by a package delivery at the door. Came back maybe 30 minutes later and brewed it anyway. The cup tasted way smoother and had this almost creamy mouthfeel I never got before. I think the grounds just had time to off-gas some CO2 and let the flavors settle. The bloom was way less aggressive too, didn't bubble up as much. I did this three more times this week and the same thing happened every time. Has anyone else noticed a big change from resting their grounds before brewing?

2 comments

2 Comments

ben2061mo ago

Actually that "off-gassing CO2" thing isn't quite how it works. CO2 leaves the grounds almost immediately after grinding, like within a minute or two. The bigger deal is the particles settling and the flavors oxidizing a tiny bit. That creamy mouthfeel you're getting is probably from the fines (super tiny coffee dust) settling into the larger grounds instead of clogging your filter. I noticed the same thing when I let my V60 grounds sit for 15 minutes before pouring. The drawdown was way faster and the cup had this silky texture. Try it with a darker roast, the effect is even more noticeable there.

carr.gavin1mo ago

Yeah the fines thing is a big part of it I think. @ben206 is spot on about darker roasts too since they're more brittle and throw off way more dust. I've been letting my light roast Ethiopian sit for like 5-7 minutes after grinding and noticing the same smoother drawdown but without losing too much of the bright flavors. The trick is finding that sweet spot where the fines settle enough to not clog but you don't let it sit so long the whole thing goes flat. I usually do a quick swirl after the bloom to knock everything down then let it rest a couple minutes before pouring.