Cups can be warmed on the heating tray of your espresso machine (if your espresso machine has one), or you can pour some hot water into the cup, and then drain it. You should also start with a pre-warmed espresso cup. To make espresso, it is good to preheat the portafilter by running hot water through it. While Robusta can be used to add character to a blended coffee, the amount of Robusta used in a blend to be used for espresso should be small. Robusta is strong, but is usually of poorer quality, having a harsher flavor. For best results, try to use 100% Arabica beans. Ideally, the coffee used for making espresso should be freshly roasted. (Note: 1 bar = 1 Megadyne per square centimeter = 0.987 atmospheres.) The espresso machine should have a boiler, and two sizes of portafilters (one for single, and another for double shots). Minimally, you need a pump-driven machine delivering at least 9 bars of pressure. To make the perfect espresso you need to have the proper espresso machine, a good coffee grinder, and excellent coffee. With a lever espresso machine, you can compensate for an incorrect grind with your own strength. Lever espresso machines have pistons in which additional pressure can be applied by external force (by you) to adapt the time as needed. A double shot contains 3 ounces of liquid pushed through 2 tablespoons of coffee grounds in the same amount of time (25-30 seconds). A single shot contains 1.5 ounces of liquid that is pushed through a tablespoon of coffee grounds in 25-30 seconds. Therefore the grind needs to be tailored to the pressure of the espresso machine. If it takes longer than this, the espresso will be bitter. The most important rule of making perfect espresso is that the pressure used should push the water through the coffee puck in 25-30 seconds. The finer the grind, the denser the puck, hence the more pressure required to force the water through it. And since espresso is the base for many other coffee drinks, your cappuccinos and lattes will also be perfect once your espresso is perfect.Įspresso is made by forcing hot water (not boiling water) under pressure through a "puck" of finely ground coffee. It is easy to learn to brew the perfect cup of espresso.
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