How Does the Natural Coffee Beans Process Work?

Natural processing, also called dry processing, is the oldest method, recorded among Arabians by the 11th century. Whole cherries dry in the sun without water, which is why it spread in dry regions. The coffee beans process runs through four steps: removing floating beans, sun-drying, observation, and removing the husk.

Sun-drying on the yard takes about two to three weeks with regular turning, and the beans are ready when internal moisture falls to roughly 10 to 14 percent. The method carries risks of impurities, uneven drying, and mold, yet it tends to amplify body and sweetness. Brewing favors pour-over to highlight that character, as in coffee processing comparisons.

As the oldest coffee processing method, the natural sun-drying process can be traced back to the method used by Arabs in the 11th century. This natural drying technique requires no large amount of water and is low in cost, making it widely popular in water-scarce regions. However, the sun-drying method also faces challenges such as the mixing in of impurities, uneven drying, and mold and spoilage. This article will break down the four steps of the sun-drying method in detail—removing floating beans, sun-drying, observation, and removing the husk—and analyze its positive and negative effects on coffee bean quality. At the same time, we will also explore how the sun-drying method amplifies the coffee's own flavors, bringing a thick body and sweetness, and include Front Street Coffee's pour-over brewing suggestions to help enthusiasts better experience the charm of sun-dried beans.

Front Street Coffee Processing Methods: Sun-Dried Processing Method: Its Impact on Coffee Bean Quality and Flavor

Sun-Drying Method

The sun-drying method can be called the oldest among coffee processing techniques. According to documented records, as early as the 11th century AD, that is, more than a thousand years ago, Arabs had already begun using the sun-drying method to process coffee cherries. Because coffee has an invigorating and refreshing effect, when it spread from the Arab world to the West, it was once given the alternative name "the wine of the Arabs."

The specific operating steps of the sun-drying method:

1. Removing floating beans

Coffee cherries picked from the coffee field must be sent to the processing plant the same day and cannot be delayed. After pouring the coffee beans into a large water tank, underdeveloped inferior beans will float on the surface of the water, while ripe and plump cherries will sink to the bottom. At this point, scoop out and remove the beans floating on the surface, and the step of removing floating beans is complete.

2. Sun-drying

Spread the coffee cherries evenly on the drying yard and turn them several times each day. This process usually lasts 2 to 3 weeks, with the specific duration depending on local climatic conditions.

3. Observation

After the sun-drying stage ends, the outer layer of the coffee seed has become dry and hard. When the moisture content inside the coffee beans drops to 10% to 14%, it indicates that the sun-drying step has been completed.

4. Removing the husk

At this point, use a huller to remove the husk, and the entire sun-drying process is complete.

The above is the complete operating process of the sun-drying method. Next, let's talk about the impact of the sun-drying method on coffee bean quality:

Advantages:

Apart from the step of removing floating beans, the sun-drying method requires no water for the remaining steps, and one bucket of water can be reused, making the cost very low. Therefore, it is widely adopted in regions where water resources are not abundant.

Disadvantages:

1. Because the sun-drying method must place the coffee beans outdoors, impurities such as dead branches and fallen leaves often get mixed in.

2. Because it relies on sunlight, the degree of drying of the coffee beans is difficult to control precisely, which may cause the coffee cherries to become "over-dried," thereby damaging the coffee beans inside.

3. During the sun-drying process, because the pulp is not removed, mold and spoilage often occur.

Flavor:

The sun-drying method allows the coffee cherries to dry naturally, and the coffee beans can mature naturally inside the fruit without interference from the external environment. Therefore, coffee beans processed by the sun-drying method amplify their own flavors, have a thick body, strong flavor, and give off sweetness.

Front Street pour-over brewing suggestion: Little Fuji 3.5 V60 dripper 90°C water temperature 1:15, total time two minutes.

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