It is then extinguished, mixed with coffee, and served very hot. If the alcohol is poured first and the coffee is poured not directly but first over the back of a spoon, the liquids are not mixed since they have different densities.
It is then cooled down, mixed with coffee, and served very hot. When alcohol is poured first and coffee is poured indirectly by being sprinkled over the back of a spoon before being combined, the liquids fail to blend due to their differing densities.