Ristretto is a very short shot of espresso coffee. A normal (double) espresso shot is a 2 fl.oz or 0.6 DL extraction over 25-30 seconds. A (double) ristretto is a 1-1.5 fl.oz (0.3-0.45 DL) extraction with the same amount of ground coffee over the same period of time.
The ristretto is very often preferred by espresso coffee lovers for its added body and fullness. To accomplish a slower extraction and subsequent lesser volume, grinding the coffee finer is the preferred method.
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