Arak is a clear, colourless, unsweetened aniseed-flavoured distilled alcoholic drink.
Arak is usually not drunk straight, but is mixed in approximately 1/3 arak to 2/3 water, and ice is then added. This dilution causes the clear liquor to turn an opaque milky-white colour, in a phenomenon known as louching. Tradition requires that water is added before ice, because if ice is added directly it results in the formation of an aesthetically unpleasing skin on the surface of the drink. As the ice causes the fat to solidify out of the arak, while if water is added first the ethanol causes the fat to emulsify, leading to the characteristic milky colour.