The Nespresso machine's high pressure extraction system, combined with the freshness and quality of the coffee, naturally produce a thick, smooth crema.Once prepared, the espresso continues to develop. Floral flavors tend to come out first, whereas others, including the heavier, more roasted aromas, are slower to emerge. The crema is essential for releasing and protecting these aromas. Immediately after its extraction, the crema, which naturally forms from liquid coffee and air, stimulates the release of aromas from the cup. Once it has settled, the crema's role reverses as it forms a coffee "cover" and prevents the most volatile aromas from escaping. The quality of the crema provides an important first impression of your espresso, and naturally influences the way you perceive it, by whetting your appetite before tasting.