Final answer:
The milk should be aerated for 15 seconds to create the perfect cappuccino or espresso macchiato. The correct answer is a) 15 seconds.
Step-by-step explanation:
The aerating process, also known as frothing, plays an important role in creating the perfect cappuccino or espresso macchiato. The milk should be aerated for 15 seconds.
This involves introducing air into the milk to create a creamy and frothy texture. By aerating the milk for the specified amount of time, it allows for the right balance of foam and steamed milk in the final drink.
The objective is to create a microfoam with tiny bubbles, which gives the milk a glossy, smooth consistency, and this process can vary based on the type of milk, the steam wand of the espresso machine, and the barista's technique.
It's best to pay attention to the consistency of the milk, aiming for velvety foam rather than focusing strictly on the time.