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Espresso is a concentrated coffee brewed by forcing hot water through finely-ground coffee under pressure. For the best espresso, use a high-quality espresso machine and freshly ground coffee with a fine grind. The ideal brewing time is around 25-30 seconds, producing a rich crema on top. Make sure your machine is properly heated and calibrated for the perfect extraction. Experimenting with different beans and grind sizes can help you find your ideal shot.