en.wikipedia.org/wiki/Espresso

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Espresso

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Espresso has a layer of crema on top — the reddish-brown foam created when hot water is forced under pressure through finely-ground beans.

It is the base for many other drinks, including the caffè latte, cappuccino, and caffè macchiato.

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Crema is the reddish-brown foam on top of an espresso shot — an emulsion of CO₂ and the coffee’s oils. A thick, even crema means the shot was pulled well.

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