AeroPress

The AeroPress tolerates a wide grind range because the plunger, not gravity, decides when the brew ends. That is why it travels well and why it is the brewer to learn on.

Why it forgives so much

In a filter cone, gravity ends the brew whenever the bed decides to let it. In an AeroPress the chamber is sealed until you press, so contact time is a number you choose. A grind two notches off still lands somewhere drinkable, which is why it is the brewer to learn on and the one to travel with.

Standard or inverted

Standard, with the cap on and the chamber on the mug, drips a little during the steep and is the safer way to hold a full chamber of hot water. Inverted, built upside down and flipped before pressing, loses nothing to the drip and lets you steep as long as you like. The cup difference is small. The spill risk is not.

Pressure does not extract

Thirty seconds of steady, gentle pressure is the whole technique. Pushing hard does not pull more out of the coffee, it forces water through whatever channel opens first and thins the cup. When the plunger hisses, stop: that is air, and pressing it through drags bitterness with it.

The concentrate trick

Brew at 1:6 with a two minute steep, then dilute to taste in the cup. It travels better, it makes an iced coffee that is not watery, and it lets one chamber serve two people without brewing twice.