Coffee Cherry: What’s Inside?

You may already know that coffee is a plant, and that coffee beans come from a bright red fruit known as the coffee cherry. But do you know exactly what's inside this coffee cherry and how its different parts affect your coffee’s flavor?

What is a Coffee Cherry?

Coffee cherries grow on coffee trees, which farmers regularly prune to maintain quality and simplify harvesting. Smaller trees tend to yield higher quality beans and greater productivity within limited cultivation spaces.

Each coffee tree produces coffee cherries that typically grow in pairs along branches. According to the National Coffee Association, one coffee tree produces roughly 10 pounds of coffee cherries per year, yielding approximately 2 pounds of coffee beans after processing. However, coffee varieties differ significantly, affecting bean characteristics such as size, flavor profile, and resistance to diseases.

Anatomy of a Coffee Cherry

Outer Skin (Exocarp)

The outer layer of a coffee cherry is bright red when ripe. Its color resembles that of cherries, which is why ripe coffee fruit is called a "coffee cherry."

Fruit Pulp (Mesocarp)

Directly beneath the outer skin lies the fruit pulp, known as the mesocarp. This sweet, fleshy layer is thin and juicy.

Mucilage

Beneath the pulp is a thin, sticky layer known as mucilage. Rich in sugars, this mucilaginous layer significantly influences the sweetness and overall flavor profile of the coffee bean during processing.

Parchment (Endocarp)

Surrounding the bean, there’s a thin protective layer called parchment or hull, which is removed in the later stages of processing.

Silver Skin (Spermoderm)

The silver skin is a fine, delicate layer that covers the green coffee bean. It usually remains intact until roasting, at which point high heat causes it to peel away, becoming a byproduct known as chaff.

Green Coffee Beans (Endosperm)

At the heart of the cherry are usually two green coffee beans, known as the endosperm or simply "green coffee beans." Typically, each cherry contains two beans. These beans have a flattened side where they face each other.

Peaberry (Single Bean Mutation)

Occasionally, due to a natural mutation, a coffee cherry produces only one bean. Known as a Peaberry, this single bean grows without the flattened side, giving it a rounder shape. Peaberries are denser and typically harder than normal beans, often considered superior in terms of roasting uniformity and flavor intensity.

Importance of Understanding Coffee Cherry Structure

Knowing the structure of the coffee cherry and how each part influences flavor can help you better appreciate coffee production, processing methods, and roasting. Next time you select naturally processed coffee beans, you’ll better understand how these distinct layers contribute to the complexity of the coffee in your cup.