How can you tell if milk is steamed correctly for a cappuccino?

The correct answer highlights the importance of achieving a specific texture and appearance in steamed milk for a cappuccino. When milk is steamed correctly, it should exhibit a velvety texture and a shiny, glossy surface. This velvety quality comes from creating microfoam, which is the result of incorporating air into the milk while steaming. The microfoam not only enhances the mouthfeel of the cappuccino but also helps create beautiful latte art due to its enhanced stability.

The glossy appearance is a sign that the milk has been properly emulsified, allowing for a smooth and even blend with the espresso. This texture is essential in achieving the right balance for a cappuccino, as it complements the espresso and adds to the overall experience.

Options suggesting warmth without being hot, thickness and opacity, or forming a stiff peak do not align with the characteristics that define properly steamed milk for a cappuccino. The latter, for example, may indicate over-aeration or too high a temperature, which disrupts the microfoam structure needed for that ideal velvety finish.