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There has been a quiet shift happening in coffee processing.
You might have seen the word mossto appear on bags, or heard it mentioned without really knowing what it means. It sounds technical, maybe even a little intimidating. But at its core, it is actually a very simple idea.
And once you understand it, it changes the way you taste coffee.
What is the Mossto Process
Mossto comes from the word mosto, which in Spanish refers to freshly pressed fruit juice, often used in winemaking.
In coffee, mossto refers to the liquid that is produced during fermentation. Think of it as the juice released from coffee cherries as they break down. This liquid is rich in sugars, organic acids, and active microorganisms.
Instead of discarding this liquid, producers reuse it.
They take this mossto and introduce it into a new batch of coffee during fermentation. In a way, it becomes a starter culture, guiding how the next batch develops.
It is not just fermentation anymore. It is controlled fermentation.
fermentation bubbles
Where did it come from
The idea is heavily inspired by wine and beer.
In winemaking, producers often reuse must or yeast cultures to maintain consistency and develop a signature profile. The same thinking started to appear in coffee farms that were experimenting with fermentation.
Producers in countries like Colombia and Costa Rica were among the early adopters. Farms that were already pushing boundaries with anaerobic fermentation began asking a simple question.
What if we could control this even further
Instead of relying on wild, unpredictable fermentation, they began capturing mossto from successful batches and reusing it. Over time, this allowed them to replicate flavour profiles more consistently.
It moved coffee processing from reactive to intentional.
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How it actually works
At a basic level, the process looks like this:
Coffee cherries are harvested and placed into a fermentation tank. During fermentation, sugars break down and microorganisms start doing their work.
As this happens, liquid builds up. This is the mossto.
Instead of letting it go to waste, producers collect this liquid. When they start a new fermentation batch, they add the mossto back in.
That liquid carries:
Active yeast and bacteria
Residual sugars
Acids and compounds from the previous fermentation
This accelerates the fermentation process and shapes how flavours develop.
It is similar to using a sourdough starter. Once you have a good base, you can keep building on it.
What it does to the cup
This is where things get interesting.
Mossto processed coffees tend to have:
More pronounced sweetness
More structured acidity
More layered, sometimes more “processed” flavour profiles
You might taste:
Riper fruit notes
Deeper florals
Wine like textures
Longer finishes
But there is also a balance to strike.
When done well, it feels intentional. Clean, expressive, and vibrant.
When pushed too far, it can become overwhelming. Too fermented, too heavy, sometimes even confusing in the cup.
Like everything in coffee, it is not about doing more. It is about doing it well.
Why producers are using it
Consistency is one big reason.
Fermentation is one of the hardest parts of coffee processing to control. Small changes in temperature, sugar content, or microbial activity can completely shift the final cup.
By reusing mossto, producers gain a level of control. They are not starting from scratch each time.
Another reason is differentiation.
In a market where many coffees can start to taste similar, mossto processing allows producers to create something distinct. Something that stands out.
And when done right, it gives them a signature.
How to approach it as a brewer
If you pick up a mossto processed coffee, approach it with a bit more intention.
These coffees are usually more soluble. They extract easier.
If it tastes too intense or heavy:
Grind slightly coarser
Lower your water temperature
Shorten your brew time
If it feels flat or muted, you can push extraction a little more.
The goal is not to fight the coffee, but to let it show what it is trying to be.
Closing thought
Mossto processing is a reminder that coffee is still evolving.
It is not just about origin or varietal anymore. Processing is becoming just as important in shaping what we taste in the cup.
But beyond the technique, there is something else.
It shows the intention of the producer. The willingness to experiment, refine, and repeat until something meaningful is created.
And when you taste a good mossto processed coffee, you can feel that.
It does not just taste different.
It feels deliberate.
