Espresso is a preparation method of coffee, where water is pressed under high pressure through finely ground coffee powder. This process yields a strong coffee, which is covered in a layer of thick, hazelnut-brown froth – the cream – which adds to its flavour.
Due to the strong roasting, and the typical portioning of 25 ml, the caffeine content of a cup of Espresso is lower than that of a normal cup of filter coffee (typically 125 ml). Espresso is usually served in small, pre-heated cups with thick walls, which can contain up to 40 ml. It is drunken sweetened or unsweetened.