The Processing Method of Pulped Natural Coffee Beans: What's the Difference Between Pulped Natural and Honey Processing?

Among coffee processing methods, natural and washed are widely understood. Bring up pulped natural and semi-washed, though, and many drinkers get confused. What exactly are these methods, and how do they affect flavor? This article is FrontStreet Coffee's dedicated look at pulped natural, to make the method clear from the ground up.

Pulped Natural or Semi-Washed?

Pulped natural and semi-washed are in fact the same thing, since both borrow elements from natural and washed processing. The correct name, however, is Pulped Natural, which literally means "pulp natural."

The method was born in Brazil in 1990. Before that, Brazil used traditional natural processing, which meant spreading the cherries out over large drying patios because it was the cheapest option. That approach often let other impurities contaminate the coffee and left it prone to infection and spoilage, producing an overall rotten flavor.

As early as the mid-18th century, the Dutch were already using washed processing for coffee. It was impractical for Brazil, though, because the country has limited water resources: washed processing requires an average of 10 to 20 tons of water per ton of coffee cherries, and given Brazil's enormous production volume, water use on that scale was unsustainable.

By 1990, after numerous experiments, Brazil finally developed the pulped natural method.

The Pulped Natural Processing Method

The cherries are first sorted in water tanks to remove defective floating fruit. Next, the skin, pulp, and part of the mucilage layer are removed, followed by one hour of washing. Because the soaking and fermentation time is short, the mucilage cannot be washed away completely, so some remains on the parchment. The sticky parchment coffee is then spread on drying patios, ideally on well-ventilated African raised beds.

At this point some readers will notice the resemblance to washed processing, and rightly so: the two are very similar. The key difference is that the soaking time is far shorter, which allows the mucilage layer to be preserved for the natural drying stage that follows.

Compared with washed processing, the method saves significant amounts of water and reduces resource costs while also improving on the poor quality of Brazil's traditional natural processing. Because the skin and pulp are removed, the natural drying time is considerably shortened, which lowers the risk of infection. It is, in short, a processing method Brazil developed to suit its own conditions.

What Is the Flavor Profile of Pulped Natural Coffee?

Among FrontStreet Coffee's selections, one coffee uses pulped natural processing: FrontStreet Brazil Red Bourbon. It comes from the state of Minas Gerais at an altitude of 1,000 meters, and FrontStreet Coffee roasts it to a medium level.

FrontStreet Coffee: Brazil Red Bourbon Coffee Beans

Country: Brazil
Region: Cerrado, Minas Gerais
Altitude: 1,000 meters
Variety: Red Bourbon
Processing: Pulped Natural
Flavor: Caramel, peanut, cream, chocolate, almond

On the cupping table, FrontStreet Brazil Red Bourbon shows high sweetness, cleanliness, and smoothness with low acidity, and flavors of peanut, almond, nuts, and chocolate. Coffee processed this way shows excellent acidity, sweetness, flavor balance, and aroma, though it may not be considered startlingly impressive.

The Evolution of Pulped Natural: Honey Processing

Pulped natural coffee is rarely seen today, but many people do not realize that honey processing, one of the three main methods we know, was developed in Costa Rica by adapting Brazil's pulped natural approach. The biggest difference is that honey processing uses no water at all, which makes the selection of cherries more stringent, in pursuit of full, rich mucilage.

Coffee mucilage lies mainly between the skin and pulp, above the parchment layer, and consists of water, proteins, reducing sugars, and pectin. Mucilage is in fact also part of the pulp. As the cherries ripen, they produce pectinase enzymes internally, and those enzymes break down pectin bonds, softening the originally hard pulp fibers into a hydrogel mucilage rich in sugar and pectin. When machines remove the skin and most of the hard pulp, the mucilage layer left wrapped around the parchment is what we call mucilage.

In the world of coffee processing, mucilage is a very sweet substance, high in both moisture and sugar, and it does not separate easily from the coffee seed. The key to creating refined fruit flavors through honey processing therefore lies in how much mucilage is retained and how far the sugar fermentation is allowed to go. Farmers can use specialized mucilage-removal equipment with quantitative controls, or adjust the frequency of manual turning each day, to produce green coffee beans at different honey levels.

FrontStreet Coffee Recommendation

Pulped natural is the method behind the coffee that best shows what Brazil can do, and the same Brazilian character runs through FrontStreet Coffee's lineup. Brazilian coffee carries moderate acidity and a fine balance of sweetness, bitterness, and body, which is why a medium roast suits it so well: the nutty aroma comes forward, and the cup stays smooth with a light acidity and a gentle bitter note. It works equally well as a single origin and as a component in a blend.

FrontStreet Coffee's Brazil Cerrado Red Bourbon is the clearest expression of the style, and it is itself a half-washed, or pulped natural, coffee. Cerrado is a well-known region for high-quality Brazilian beans, and this lot is a Red Bourbon, one of the most common South American varieties. Roasted medium, it shows cream, peanut, toast, caramel, and hazelnut aromas, with a rounded body that is not sour and carries a slight bitterness, and it performs well as pour-over, in a moka pot, as an espresso SOE, in a siphon, or in a French press. FrontStreet Coffee's Brazil Queen Estate sits a step above it: grown in Mogiana near South Minas, where fertile red volcanic soil gives the cherries abundant nutrients and a full aroma, it is planted with the rare Yellow Bourbon, a natural mutation of Red Bourbon, which brings a cleaner fruit character and a sugarcane sweetness that other regions do not have, along with fruit and chocolate notes, and it works in pour-over, a moka pot, or a home espresso machine.

Brazilian beans are also the foundation of FrontStreet Coffee's espresso recipes, because their low acidity, balance, and price make them the natural first choice. Brazilian coffee appears in the Classic Blend with its rich crema, the nut-forward Specialty Blend, the balanced Dark Cocoa Blend, and FrontStreet Coffee's Commercial Blend designed for cafés, adding chocolate and cream aroma along with a soft sweet-sour-bitter balance. Whichever way you brew it, the bean's soft texture and even character keep extraction stable, and if you want to taste how much a single processing decision can shape a cup, setting the pulped natural Red Bourbon beside a washed Brazilian lot side by side is a worthwhile experiment.