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A sweet, light brown layer of foam that develops on a shot of espresso.
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What is crema in coffee?

Technically crema forms on espresso, not coffee. Crema is the layer of light colored foam on top of an espresso shot. Crema only forms when a shot of espresso is pulled correctly. The composition of crema is the natural fat content coffee grinds, which is emulsified when a shot is pulled. During and after the shot is pulled and the espresso is in the cup, the crema rises to the top, forming a thin layer on the espresso.