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Ä¿ÇÇ : espresso crema

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Over-extraction is signified by a slow, broken trickle with a dark brown (burnt) crema. This means that the water and coffee were in contact for too long. This occurs if the coffee grind is too fine, effectively blocking the filter, or by using too much coffee in the filter basket. The coffee will scorch in the basket and the espresso will taste bitter and burnt. Over-extraction can also occur if the brew cycle is too long and harsh coffee acids and tannins are extracted by too much water passing through the coffee. The appearance of white marks or streaks appearing towards the end of the pour is an indication of the brew cycle being too long.

Under-extraction is signalled by a rapid, bubbling flow from the spout and a thin, broken crema. This can be a result of using a coffee grind that is too coarse, by not using sufficient coffee or from tamping too lightly. All result in the hot water passing through the coffee too fast so it is unable to extract the desired coffee solubles and oils. The result is a thin, insipid sour brew of espresso. Under-extraction can also be a result of the water temperature being too low.

By carefully watching out for these symptoms the espresso machine operator or barista can take corrective action to ensure delicious espresso drinks are always available.

 


 


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