Coffee combines excellently with many ingredients. Milk is by far the most used and beloved addition to coffee. The largest number of coffee variations offered are prepared with milk or milk foam. Cappuccino is absolutely the most famous and widely consumed coffee with milk and foam in the world. You can only make the perfect cappuccino with the right ingredients, accessories, and preparation.

What do you need for milk foam?

For the best milk foam, use fresh, high-quality whole milk. Milk plays an essential role in a cappuccino: not only because it makes up a large part of the drink, but also because it adds important properties. The fat content of approximately 3.5 percent helps to bind aromatic molecules from the coffee, as well as air and water particles. This ensures that the foam remains stable. Additionally, the proteins in the milk—about 3.2 percent—enable the milk to froth well and give the foam a creamy texture.

Whole milk yields the best result because the fat and protein content is well balanced. If you use semi-skimmed milk, you will still get milk foam, but it will be less firm. Due to the lower fat content, there are insufficient fat particles to effectively hold the air and moisture in the foam, causing the foam to collapse more quickly.

Milk varieties for cappuccino

Milk alternatives, such as soy or almond milk, also contain a different fat-to-protein ratio. Sometimes this is corrected by the producer to allow the milk to froth better. These milk alternatives burn more easily than cow's milk. It is therefore important to heat these milk alternatives to about ten degrees lower than cow's milk when using them for your latte macchiato or cappuccino.

How do you froth milk?

The process of frothing milk with the steam wand of your espresso machine consists of four parts:

1. Add air to the milk by holding the tip of the steam wand just below the surface of the milk. A lot of air will be added, especially at the top of the milk pitcher, causing foam to form quickly there.
2. Once there is enough foam, we start heating the milk and 'rolling' it. The steam wand goes slightly deeper into the milk to mix the foam with the milk and heat it further.
3. Next, tap the milk jug on a hard surface to remove large air bubbles, and swirl the jug around to distribute the bubbles evenly throughout the milk.
4. And finally, you polish the milk by gently shaking the milk jug so that the milk swirls inside.
5. Your perfect milk foam is ready to be poured!

What should you look out for?

To prevent the milk from burning during frothing, it is important to start with milk that is as cold as possible. This gives you more time to properly “stretch” the milk—the process of incorporating air into the milk—before heating it to the ideal temperature of 60 to 70 degrees. If the milk gets too hot, it will start to boil and curdle. This not only causes an unpleasant odor but also a bitter taste in your cappuccino.

If you use the steam wand of an espresso machine, you can estimate the temperature by touching the bottom of the carafe:

• It feels warm around 32 °C,
• at 50 °C it gets hot,
• and from about 62 °C it is too hot to hold.
  

Ideally, you should start the milk at a temperature between 3 and 5 degrees. A handy tool for keeping milk at this temperature is the Jura Cool Control. This device keeps the milk constantly at 4 degrees and offers optimal hygiene.

Making good milk foam is a skill you need to master. The first attempts won't be perfect — and that is completely normal. Keep practicing, experiment with your technique, and discover what works best for you. Practice makes perfect!

Differences between espresso machines

With a semi-automatic espresso machine and steam wand, you have complete control over the frothing process: you decide how much foam to make, how thick it becomes, and how warm the milk gets. However, this does require some practice and experience.

Fully automatic machines take this work off your hands and froth the milk automatically. This is very user-friendly, but the foam is usually slightly less thick and stable than when you make it by hand.

In addition, automatic milk frothers are also available. These devices produce firm foam at the touch of a button. You simply need to add milk, put the lid on, and within 90 seconds your milk foam is ready for use.

It takes practice and experience to make the perfect cappuccino, but with the right accessories, good coffee and milk, and plenty of practice, you will soon be making the perfect cappuccino with delicious milk foam yourself.