Moka Pot — brewing guide

The moka pot is a pressure brewer, but the pressure comes from steam, not a pump. Sealed in the boiler, heated water builds roughly one to one-and-a-half bar of vapor pressure — enough to push hot water up the funnel and through the coffee bed. That is a fraction of espresso's nine bar, which is why moka coffee is strong and syrupy but not espresso, and why it needs a fine-but-not-espresso grind, never tamped: too much resistance and the pot sputters and scorches.

The method's built-in flaw is a rising temperature curve. As the boiler empties, less water absorbs the same heat, and the final fraction is pushed through by superheated steam — the hottest, harshest part of the brew. Two habits fix most bitter moka: start with hot water in the base so the coffee spends less time baking over the flame, and end the brew early — when the flow turns pale and starts to gurgle, take it off the heat and cool the base under the tap to kill the pressure.

Keep the heat low and the lid open so you can watch the flow: it should rise steadily, like slow honey. The ratio is largely fixed by the hardware — fill the basket level without packing and the boiler to the valve — landing around 1:7 to 1:10, a concentrate you can drink straight, lengthen with hot water, or pour over ice.