What to Do When Espresso Lacks Crema, and What Is Espresso Crema Made Of?

What is Espresso Coffee?

Espresso is a very small cup of coffee, finished in just two or three sips, with a flavor so intense that many people find it hard to take. The small serving and the powerful taste are why espresso has limited appeal in China. Once it is mixed with milk into a latte, though, or with water into an Americano, these drinks become hugely popular.

In the cup, espresso shows dark coffee liquid at the bottom with a layer of golden-brown crema floating on top. Is that crema made of oil?

We all know peanut oil is pressed from peanuts, and dark-roasted beans secrete oil on their surface. So what makes up the layer of crema an espresso machine extracts?

Italians call this top layer "crema," and this unique, rich foam can only be produced by an espresso machine, with pressure as the key. An espresso machine generates 9 bars of water pressure to squeeze the coffee puck. Under that pressure, the carbon dioxide in the grounds reaches a supersaturated state in water, so instead of releasing, the CO2 dissolves directly into the coffee liquid. During extraction the fats in the coffee are emulsified, and those fats encapsulate the carbon dioxide. Being lighter than water, they gradually separate, and the golden crema floats to the surface, creating its beautiful appearance.

So this golden, delicate crema is formed when insoluble coffee oils encapsulate carbon dioxide. How, then, can you make sure your espresso has beautiful crema?

What Constitutes Quality Crema?

According to FrontStreet Coffee, quality crema looks golden-yellow, with a delicate surface and even color. Swirl it and it should feel smooth like cream, clinging noticeably to the walls of the cup. Beyond making espresso look better, it enriches the taste and aroma, protects the coffee's flavor, and helps latte art fuse and hold its pattern when you make hot milk drinks. Perhaps this is why people go to such lengths in pursuit of the perfect espresso.

How to Achieve Rich Crema

From extraction experience, FrontStreet Coffee believes rich crema is actually quite simple to achieve. First, choose beans with high oil content and plenty of carbon dioxide, such as medium-dark roasts within their optimal tasting window of 45-60 days, or fresh espresso blends containing a certain proportion of Robusta. On FrontStreet Coffee's bean menu, for example, both the FrontStreet Commercial Blend and the FrontStreet Classic Blend easily produce beautiful crema, precisely because they contain a small amount of Robusta.

Once the right beans are chosen, they must be paired with fresh grinding, a stable high temperature, sufficient extraction pressure and reasonable extraction parameters. Meeting these key factors is essential to getting espresso rich with dense crema.

Analyzing Crema Quality

Overall, the fresher the beans and the darker the roast, and the higher and more stable the equipment pressure, the better the crema performs. Next, FrontStreet Coffee will show you how to judge espresso quality by reading the crema's patterns, and by extension how to solve common extraction problems.

No Crema or Thin Crema:

The problem likely lies in aged beans, including poorly stored beans and pre-ground coffee. The longer beans are kept, the more they exchange gas with the air, so more carbon dioxide is lost and less crema forms. Insufficient machine pressure, low temperature, an overly coarse grind and inadequate tamping pressure are also causes of thin crema.

Whitish Crema:

If your espresso has decent crema thickness but lacks golden color and tastes mostly sharp and acidic, the cause is likely a lighter roast. Using a pour-over bean that emphasizes fruity acidity for espresso, for instance, easily yields unpleasant acidity and astringency from under-extraction, along with paler crema.

Coarse, Bubbly Crema:

This kind of crema typically lasts a very short time and dissipates quickly. It comes from beans that are too fresh. Freshly roasted beans hold large amounts of carbon dioxide; when too much gas is forced into the coffee liquid, the emulsified oils cannot encapsulate it and break down easily.

Clotted Crema:

This kind of espresso usually shows obvious lumps when swirled, with an uneven crema surface and poor fluidity, much like over-foamed milk that is hard to spread and blend.

FrontStreet Coffee Recommendation

To get dense, golden crema consistently, the right blend does most of the work. FrontStreet Classic Blend is the first choice: built specifically for espresso and moka pot, its biggest strength is outstanding crema, so even a beginner on a non-professional home machine can pull a dense, silky shot. Based on the traditional Mamba recipe, it is rich and mellow, and it is the base for the lattes, cappuccinos and Dirty drinks you make at home.

If you want a fruit-forward option for milk drinks, FrontStreet Strawberry Sugar is a popular fruity espresso blend that echoes the scent of strawberry soft candy by layering the natural flavors of Arabica beans from different origins. It suits daily home drinking and cafe service alike, and works across several brewing methods. For a budget-conscious route to generous crema, FrontStreet Black Cocoa Blend uses 100% Arabica beans for full body and ample crema at a friendly price, striking a balance between quality and value that keeps it a favorite for anyone watching costs.