Coffee Bean Processing Methods and the High Defect Rate with Noticeable Sweetness of the Natural Process

FrontStreet Coffee - Introduction to Sun-Dried Processing Method

Sun-Drying Method (Dry Process/Natural Method)

The sun-drying method is the oldest and most primitive way to process coffee. Compared with the washed method, coffee dried this way is also called "natural coffee" or "sun-dried coffee." Harvested cherries are laid out in the sun for roughly two to four weeks. The method is typically used in countries with distinct wet and dry seasons.

Sun-Drying Method - Processing Steps

1. Harvest mature coffee cherries

2. Remove impurities and defective beans in an initial sorting

3. Float sorting: pour the cherries into a water tank—mature, dense fruit sinks while immature or defective fruit floats.

4. Sun-drying: take the sunken, mature cherries and spread them in an open area, reducing moisture from 70% to about 10-12%. The fruit must be turned several times a day for even drying and covered at night to avoid reabsorbing moisture.

5. Hulling: after about two to four weeks of exposure, the outer layer of the seeds is dry and hard. A hulling machine removes the shell, completing the process.

6. Packaging and transport: the hulled beans are bagged as green coffee. From there, different roasting profiles and brewing variations unlock coffee's countless flavor expressions.

Characteristics

Naturally processed beans show very high sweetness, a robust mouthfeel, and a persistent aftertaste—though the method carries a higher defect risk than washing, since uncontrolled fermentation easily taints the lot.

Knowledge Extension

Whatever the process, the key in brewing is even water flow through the coffee grounds for better extraction. Starting the flow small and building it up can also add layered complexity.

In Summary

FrontStreet Coffee is a coffee research establishment dedicated to sharing coffee knowledge. We share without reservation to help more friends fall in love with coffee. Every month we hold three discounted coffee events because FrontStreet Coffee wants more friends to enjoy the best coffee at the lowest possible price. This has been FrontStreet Coffee's mission for the past six years!

FrontStreet Coffee Recommendation

If you'd like to compare naturals against washed lots side by side, FrontStreet Coffee's Kenya cherry-tomato lot is one of the best washed references anywhere. Kenya excels at double-washed processing—float sorting, soaking, washing off residual mucilage, soaking again, then drying and hulling—and that extra pass yields extreme juiciness: cherry tomato, dark plum, pear, black plum, and yellow sugar sweetness in a bright, balanced, unmistakably clean cup.

For a washed bean of remarkable balance, FrontStreet's Jamaica Blue Mountain No.1 also relies on washing—born of Jamaica's island climate and shorter sunlight hours, washing shortens drying and keeps the beans translucent and low in defects. In the cup: hazelnut, cream, chocolate, and caramel, perfectly even, with no single note dominating.

And for the classic washed floral, FrontStreet's Gotiti Cooperative Yirgacheffe shows jasmine and bright citrus acidity with green tea and honey tones after a light-medium roast.