Swirl the coffee in one direction. Fill in the milk, swirling in the opposite direction.
Pour the milk in the centre. Swivel upwards, getting faster as you go & pour a line down the middle.
On one side, create 2 dabs of milk, one on top of the other & pour a line down, going through both dabs.
Repeat on the other side with another 2 dabs, going through both with a line, creating 2 hearts.