Do espresso coffee beans explain hard, clumping crema?

Espresso crema turns hard and clumps mainly when the shot sits too long before use. Right after extraction, the crema and liquid still move together, so a gentle swirl blends them. Wait too long and the crema separates and stiffens, which makes it a poor base for milk drinks and latte art.

Bean choice and grind also matter: freshness, roast level, and how long to grind coffee beans before extraction all affect how much crema forms and how it behaves. Stirring can partly restore a separated shot, but the practical fix is to pour milk drinks within the first moments after pulling the espresso.

Many friends have reported to Front Street that when making milk coffee, although the espresso's crema is thick, it is as hard as whipped cream and lacks fluidity. This kind of crema not only tastes bad but also becomes an obstacle when latte art is attempted. In fact, clumping and hardening of the crema are usually closely related to the timing of operations and the selection of materials. This article will start from actual cases received by Front Street and analyze several common factors that cause espresso crema to harden, including leaving it too long after extraction and issues with materials such as coffee beans and grinding, and provide practical solutions such as stirring to restore it, helping you grasp the golden time to use espresso and make smooth, delicious milk coffee.

Recently, Front Street has received feedback from many friends saying that the espresso they use to make milk coffee has a crema layer that looks quite thick, but it just doesn't flow much, like whipped cream, and is hard overall! This kind of crema not only feels bad when drinking, but also holds you back when doing latte art! If you encounter this situation, it is most likely caused by the following reasons!

I. Operational issues

Operational mistakes are one of the most common factors in this kind of situation! Right after extraction, the crema and the coffee liquid will closely adhere to each other for a short time. With just a gentle swirl, we can see all the crema flowing together with the coffee liquid, very smooth! Espresso at this time is most suitable for drinking directly or making other espresso drinks.

But if you do not use the espresso immediately after extraction and instead turn to do other things, then this layer of crema will not only slowly dissipate over time, but also separate from the coffee liquid. At this point, if you swirl this cup of espresso again, you will see this scene: (pretend it is an animated image, the coffee liquid moves but the crema does not)

Although the coffee liquid below will swirl along, the crema on top, except for a few thinner areas that move slightly, mostly remains completely still! Crema in this state is not very suitable for making hot milk coffee, because the crema is too hard, and the light, thin milk foam simply cannot push it, so naturally you cannot pour a beautiful pattern!

Therefore, it is best to use it immediately after espresso extraction is completed. Of course, if you are delayed by other matters and miss the optimal time for the espresso, causing the crema to harden, then you need to rely on stirring to let the crema "reconnect" with the coffee liquid and restore better fluidity.

II. Material issues

To make a cup of espresso, what materials do we need to use?

The above content is compiled by CoffeeHunters, a coffee news website.