Ristretto
Ristretto (italian pronunciation: [risˈtretto]) is a "short shot" (30 ml from a double basket) of a more highly concentrated espresso coffee. it is made with the same amount of ground coffee, but extracted with a finer grind (also in from 20 to 30 seconds) using half as much water. a normal short shot might look like a ristretto, but in reality, would only be a weaker, more diluted, shot. the opposite of a ristretto (which means in italian, "shortened, narrow") is a lungo ("long"), which is a double shot. the french call a ristretto a café serré. regardless of whether one uses a hand pressed machine or an automatic, a regular double shot is generally considered to be around 14–18 grams ...
Source: Wikipedia
