Costa Rica Tarrazú La Pastora Estate Low-Temperature Anaerobic Fermentation Processing Method and Costa Rican La Pastora

FrontStreet Coffee: Costa Rica Tarrazú La Pastora Low-Temperature Anaerobic Fermentation

Finca La Pastora in Costa Rica has over 60 years of history and now boasts modern production and processing facilities. The farm owner, Minor Esquival Picado, is a highly creative coffee grower who enjoys experimenting with innovative processing methods and production models to genuinely achieve sustainable coffee development.

The farm is located in the Dota region of the Tarrazú growing area, at an altitude of 1700-2000 meters. It enjoys an excellent ecological environment with shade trees including Poro, avocado, cedar, and Dama, while fertile volcanic soil and abundant rainfall provide superior conditions for coffee cultivation. Excellent production standards and sophisticated processing techniques have earned the farm a considerable reputation, as well as outstanding results in professional competitions.

Low-Temperature Anaerobic Washed Processing

For processing, a completely new low-temperature anaerobic washed method is used, selecting only deep red, fully mature coffee cherries. After float washing and depulping, special active yeast is added, and the cherries are soaked in 6°C low-temperature spring water for 16-24 hours of fermentation.

Generally speaking, "anaerobic" means an oxygen-free state - placing the coffee in sealed containers, or covering it with certain substances, to ferment. Fermentation can produce new byproducts and unexpected flavors, but the process requires precise control of sugar content, temperature, pressure, pH, and time.

Coffee Cherry Structure and the Fermentation Process

Before discussing fermentation, it helps to understand the structure of the coffee cherry. The sweetness of coffee cherries is mainly concentrated in the juice. Coffee cherries are the fruit of Rubiaceae shrubs, and the mucilage contains sugars and aromatic compounds that contribute to their "flavor." The concentration of these sugars and compounds depends on the coffee variety, fruit maturity, soil, and other factors.

Removing the bulk of the mucilage from coffee cherries to obtain the coffee seeds (beans) requires fermentation. This La Pastora lot uses the low-temperature anaerobic washed method described above: only deep red, mature cherries are selected, then float washed and depulped, treated with special active yeast, and soaked in 6°C low-temperature spring water for 16-24 hours of fermentation. After fermentation, the beans are laid out on African raised drying beds for sun drying, following a stable, slow drying process lasting up to twenty-two days.

Compared with other methods, anaerobic fermentation processes are easier to control, and their flavors ultimately manifest as multi-layered, soft, and rich acidity. The washed process helps extend fermentation time, producing a softer texture, complex acidity, and more refined flavors. This Costa Rica La Pastora low-temperature anaerobic washed coffee shows elegant lemon acidity, cherry and apple flavors, and notes of dark chocolate and brown spice in the aftertaste.

FrontStreet Coffee Recommendation

If this low-temperature anaerobic washed La Pastora intrigues you, FrontStreet Coffee's range of washed specialty beans is well worth exploring. The washed process strips away the skin, pulp, and mucilage before drying, yielding beans with bright fruit acidity, a clean cup, and a fresh profile that lets each origin's own character shine. Highlights include FrontStreet Coffee's Gedeb Cooperative Yirgacheffe, which maximizes jasmine florals and bright citrus acidity with green tea and honey tones after a medium-light roast, and the Kenya "Cherry Tomato" - double washed for an intensely juicy, sweet-tart cup of cherry tomato, dark plum, snow pear, and brown sugar flavors.