The Ultimate Guide to Coffee Processing

Natural processing is the oldest method in the book, where the cherry remains fully intact during drying. In the roastery, this is our "sugar management" challenge. Because the seed is dried inside the fruit, it absorbs a massive amount of sugars and volatile compounds, leading to that signature boozy, jammy profile. However, this also makes the beans more "heat sensitive" due to the outer fruit residue. We roast these with a gentler initial energy and a cautious approach to the development phase; if you hit a natural too hard, you risk "tipping" the beans or scorching those delicate sugars before the core is developed.

Fully washed processing is the gold standard for transparency, where the fruit is completely removed through mechanical depulping and fermentation before the beans ever touch a drying bed. In the drum, this creates our most "honest" roast. Without fruit sugars to mask the profile, any defect in the green coffee or a slip in our heat management has nowhere to hide. Because washed beans are typically denser and more uniform, they require a high-energy "shove" at the start of the roast to penetrate the core cleanly. We focus on a disciplined Maillard phase to build a base of caramel sweetness that supports - rather than smothers - the vibrant, structured acidity that defines this process.

Honey processing is the bridge between Washed and Natural. We depulp the cherry but leave a specific percentage of "mucilage" (the sticky honey-like layer) on the bean during drying. This creates a fascinating thermal puzzle in the drum. The beans are "stickier" and can behave unpredictably during the Maillard phase. The goal here is a balanced profile - retaining the creamy mouthfeel of a natural but with the refined acidity of a washed coffee. We find Honey lots often need a very steady, declining Rate of Rise (RoR) to ensure that the increased sweetness doesn't turn into a muddled, "baked" flavour.

Experimental methods like Anaerobic Fermentation (oxygen-free tanks) and Carbonic Maceration (CO2-rich environments) are the cutting edge of specialty coffee. These processes use controlled environments to manipulate specific yeast and bacteria behavior, often resulting in "impossible" flavours like cinnamon, bubblegum, or intense tropical funk. From a roasting standpoint, these are the most volatile beans we handle. They are often highly soluble, meaning they give up their flavors very easily. We have to be incredibly disciplined with our drop temperatures -even five seconds too long in the drum can turn a complex, lactic masterpiece into an over-extracted, bitter cup.