Why fermentation matters in coffee processing

Once cherry is picked, yeasts and bacteria start breaking down the sugars in the fruit and mucilage. In conventional washed processing that stage is short and mostly about removing mucilage. In the lots here, producers manage it as a flavour step – controlling oxygen, time, temperature and the microbes present – to develop fruit, acidity and body. Our guide to coffee fermentation explains what it means for the green coffee you buy, and our glossary entry has the short version.

Types of fermentation in this range

Anaerobic: sealed, oxygen-free tanks. Extended fermentation: longer than usual, often temperature controlled. Carbonic maceration: whole cherry in a CO₂-filled tank. Yeast inoculation: selected yeast strains added to steer the result. Co-fermentation: fruit or other ingredients fermented with the coffee – see our co-fermented coffee guide and infused range. Lactic fermentation favours lactic acid bacteria for a creamier body.

Roasting fermented green coffee

Treat these as aromatic, sugar-rich lots. Lighter roasts with controlled development keep the fruit vivid; long development turns fermentation notes boozy or ashy. Many fermented lots colour faster than their density suggests, so ease off early heat and follow the rate of rise through first crack. Give them time to rest – fermented lots often open up after several days.

Origins in our fermented range

Colombia leads – producers there pioneered many of these protocols – followed by Peru, Brazil, Mexico and Ecuador. For the economics behind it, read why producers take risks on varietals and processes.

Granos de café verde fermentados

Café café verde fermentado sin tostar para tostadores. Todo café fermenta durante el procesamiento, pero estos son lotes en los que el productor ha controlado y fermentación extendida deliberadamente: tanques sellados anaeróbicos, tiempos más largos, maceración carbónica, levaduras añadidas o cofermentación, para crear sabores específicos. Espera tazas expresivas y con protagonismo de la fruta. Compra desde 0.5 kg, con muestras disponibles para la mayoría de los lotes, o da un paso atrás y compáralos con todos los cafés café verde que tenemos. ¿Buscas café tostado? Estos son granos crudos que tú mismo tuestas: aquí te explicamos cómo empezar.

Tu guía de Granos de café verde fermentados

Why fermentation matters in coffee processing
Once cherry is picked, yeasts and bacteria start breaking down the sugars in the fruit and mucilage. In conventional washed processing that stage is short and mostly about removing mucilage. In the lots here, producers manage it as a flavour step – controlling oxygen, time, temperature and the microbes present – to develop fruit, acidity and body. Our guide to coffee fermentation explains what it means for the green coffee you buy, and our glossary entry has the short version.
Types of fermentation in this range
Anaerobic: sealed, oxygen-free tanks. Extended fermentation: longer than usual, often temperature controlled. Carbonic maceration: whole cherry in a CO₂-filled tank. Yeast inoculation: selected yeast strains added to steer the result. Co-fermentation: fruit or other ingredients fermented with the coffee – see our co-fermented coffee guide and infused range. Lactic fermentation favours lactic acid bacteria for a creamier body.
Roasting fermented green coffee
Treat these as aromatic, sugar-rich lots. Lighter roasts with controlled development keep the fruit vivid; long development turns fermentation notes boozy or ashy. Many fermented lots colour faster than their density suggests, so ease off early heat and follow the rate of rise through first crack. Give them time to rest – fermented lots often open up after several days.
Origins in our fermented range
Colombia leads – producers there pioneered many of these protocols – followed by Peru, Brazil, Mexico and Ecuador. For the economics behind it, read why producers take risks on varietals and processes.

Tus preguntas, respondidas

Is all coffee fermented?

To some degree, yes – fermentation happens whenever cherry or mucilage sits before drying. 'Fermented' coffees are ones where the producer deliberately controls or extends that stage to shape flavour.

What does fermented coffee taste like?

More complex fruit and acidity than conventional lots: tropical fruit, berries, wine, spice, sometimes yoghurt or rum-like notes. Well-made lots are clean and vivid; poorly controlled ones taste vinegary or funky.

What is co-fermented coffee?

Coffee fermented together with other ingredients – usually fruit, sometimes spices or yeasts from other fermentations – so their compounds influence the coffee. It's debated in specialty, and we always label it. More in our co-fermented coffee guide.

Are fermented coffees good for espresso?

They can make striking single-origin espressos, especially drunk black, but their intensity can dominate a blend or clash with milk. Many roasters use them as a limited release or a filter offering.

¿Ofrecen muestras o lotes de prueba antes de comprometerse con pedidos más grandes?

Sí, ofrecemos muestras de la mayoría de nuestros cafés. Si necesitas una muestra más grande de lo que normalmente está disponible, te recomendamos probar una de las opciones de menor cantidad que aparecen en nuestro sitio. Así, puedes probar el café antes de comprometerte con un pedido más grande.

¿Qué tamaños o cantidades puedo pedir?

Ofrecemos café desde tan solo 0.5kg (1 lb) hasta sacos completos. Si buscas cantidades mayores que las que aparecen en nuestro sitio, ¡ponte en contacto con nosotros! Estaremos encantados de ayudarte a organizar y hacer un pedido personalizado. Queremos asegurarnos de que recibas exactamente lo que necesitas.

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Tu guía de Granos de café verde fermentados

Why fermentation matters in coffee processing

Types of fermentation in this range

Roasting fermented green coffee

Origins in our fermented range

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Tus preguntas, respondidas

Is all coffee fermented?

What does fermented coffee taste like?

What is co-fermented coffee?

Are fermented coffees good for espresso?

¿Ofrecen muestras o lotes de prueba antes de comprometerse con pedidos más grandes?

¿Qué tamaños o cantidades puedo pedir?

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