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Espresso is a concentrated beverage
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brewed by forcing a small amount
of nearly boiling water under pressure
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through finely ground coffee beans.
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It has more caffeine per unit volume
than most beverages,
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but the usual serving size is smaller
than a standard cup of coffee.
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The act of producing a shot of espresso
is often termed "pulling a shot".
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Methods of preparation differ
between drinks and between baristas.
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Tamping down the coffee promotes
the waters even penetration of the ground.
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The espresso was made by forcing
very hot water under high pressure
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through finely ground compacted coffee.
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The process produces
almost syrupy beverage
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by extracting both solid
and dissolved components.
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[Wikipedia
The Free Encyclopedia]
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[Espresso, De Cafe Baristas, California
April 10, 2013]