Coffee may be brewed by several methods; they are boiled, steeped, or pressured. The earliest method was brewing coffee by boiling water such as Turkish coffee. It is prepared by pouring the coffee beans to a fine powder, then adding it to water and bringing it to the boil for no more than an instant in a pot. It produces strong coffee with a layer of foam on the surface and sediment settling at the bottom of the cup or glass.
Automatic coffeemakers brew coffee using gravity. Hot water drips onto coffee grounds held in a coffee filter, allowing the water to seep through the ground coffee while extracting its oil and essences. French press is an example of a device in which coffee may be brewed by steeping. Another method is the espresso method which forces hot pressurized and vaporized water through ground coffee. It needs single cup coffee machines to produce espresso beverage. It is more concentrated and has more complex physical and chemical constitution. Coffee may also be brewed in cold water. » Read more: In the ways of coffee preparation