Ristretto

Ristretto (Italian: [risˈtretto]),[1] known in full in Italian as caffè ristretto, is a "short shot" (20 ml (0.7 imp fl oz; 0.7 US fl oz) from a double basket) of a highly concentrated espresso coffee.

[2] The opposite of a ristretto (Italian for 'shortened, narrow') is a lungo ('long'), which has double the amount of water.

[4] Thus, a "double ristretto" consumes the same amount of coffee beans but fills only a single shot glass.

[5] A ristretto's chemical composition and taste differ from those of a full-length extraction for three reasons: Straight ristrettos—shots that are traditionally drunk from a demitasse and not diluted into a larger cup containing milk or water—could be described as bolder, fuller, with more body and less bitterness.

Diluted into a cup of water (e.g., americano or long black) or milk (e.g., latte or cappuccino), ristrettos are less bitter and exhibit a more intense espresso character.