In basic terms, a macchiato is espresso, which is made first, followed by the addition of a smaller amount often just a dollop of steamed milk and foam.
In Spain and Portugal the equivalent of the caffè macchiato is the cafè cortado, a version without foam, where the milk is simply heated.
But traditionally, macchiatos are always served hot, not cold.
Fill the portafilter with grounds.
One big difference between a latte and a latte macchiato is the order.
Usually, this milk foam is around 5mm thick.