What is inside a cacao pod

A cacao pod is a ribbed fruit that grows straight off the trunk and holds 20 to 60 seeds wrapped in sweet white pulp. It is roughly 10 to 33 cm long. Those seeds are the cacao beans, and every bar of chocolate starts with them. The figures come from the University of Florida's IFAS extension guide to growing cocoa, and a 2019 paper in Frontiers in Plant Science gives the same 20 to 60 range.

One pod, from the outside in. A ripe pod holds 20 to 60 beans in white pulp, and each bean is two cotyledons inside a thin shell.

Part	What it looks like	What happens to it
Husk (pericarp)	Thick, ribbed, 10 to 33 cm long. Green, green-white or red when young, yellow, orange or red when ripe	Split open by hand, ideally with a blunt wooden tool
Pulp (mucilage)	White to pinkish, sweet and tart, 10 to 15 percent sugar	Eaten fresh off the seeds, or left on the beans to feed fermentation
Placenta	A fibrous central strand the beans hang from	Pulled out when the beans are scooped
Beans (seeds)	20 to 60 per pod, packed in rows around the placenta	Fermented, dried, then sold to chocolate makers
Shell (testa)	A papery skin around each bean	Cracked off and blown away after roasting
Cotyledons (nib)	Two folded halves, deep purple to pink to white when fresh	Ground into chocolate
Germ (embryo)	A tiny sprout at one end of the bean	Killed by the heat and acid of fermentation

The tree grows its fruit on the trunk

The first surprise for most people is where the pods hang. Cacao is cauliflorous, which means it flowers and fruits on the trunk and older branches instead of at the tips. The UF guide says one to five small flowers rise from each cushion on the bark, and a cushion can flower again and again. The flowers are small, with five petals, and the guide says cacao is normally pollinated by tiny midges. Many cacao types also need pollen from a compatible tree to set fruit.

From a pollinated flower to a full-sized pod takes about five to six months, depending on temperature, by the UF account. Cornell University's chocolate exhibit says about six months. A strong tree in good conditions can carry up to 50 pods a year, which is why one tree's harvest makes only a handful of bars.

The colors tell you about the tree

Pod color depends on the variety. The UF guide describes pods that start green or green-white and turn yellow as they ripen, and others that start red and pick up yellow and orange. The C-spot atlas, a long-running reference on cacao strains, describes Criollo pods as warty and pointed with a red blush. The Amelonado type grown across West Africa is named for its smooth, round, melon-like shape. Farmers judge ripeness largely by that color change. ICCO says each pod is cut from the tree by hand with a sharp blade, with a hooked knife on a pole for the high ones.

The white pulp is the part people eat

Open a fresh pod and you do not see anything brown. You see a tight column of beans packed in glossy white pulp. The UF guide calls it a white, pinkish or brownish mucilage that is sweet and slightly acidic, and it says the seeds can be pulled out and the pulp around them eaten. It is sweet and tart and tastes nothing like chocolate.

The pulp matters to chocolate for a second reason. The Frontiers paper measures it at 10 to 15 percent sugar. That sugar is the fuel for fermentation, the step that turns a bitter seed into something that can taste like chocolate. When a farmer piles beans in a box, the pulp is what the yeasts and bacteria eat first.

Inside each bean

A cacao bean is a seed with three parts. On the outside is the shell, called the testa. Inside are two cotyledons folded into each other, which become the nib once the bean is roasted and cracked. At one end sits the germ, the part that would grow into a tree. Most of a bean is cotyledon, and that is the part ground into chocolate.

Fresh cotyledons are not brown. A team at Penn State, writing in a study of seed color in Theobroma cacao, notes that fresh seeds range from deep purple to pink to white. The purple comes from pigments called anthocyanins. Most of the world's cacao, including West African Amelonado, has dark violet cotyledons, according to C-spot. Pale or white beans are rare and prized. They turn up in some Criollo trees and in cultivars like Porcelana, whose pale green pods and light pink seeds lack most of that pigment.

How purple turns brown

Brown comes later, from fermentation and drying. During fermentation the heat and acid kill the germ and break down the cell walls inside the bean. Pigments and other compounds start to react, and the purple fades. A 2021 study in Scientific Reports describes this breakdown as the start of the reactions that build chocolate flavor. Drying finishes the job, as the beans darken toward the familiar cocoa color.

That color change is also how the trade checks quality. In a cut test, an inspector slices a sample of beans lengthwise and sorts them by what the inside looks like. Well-fermented beans are mostly brown and open in a crumbly, ridged pattern. Purple beans were stopped too early. Slaty beans are gray and dense and barely fermented at all, and chocolate made from them tastes very bitter and astringent. Pale Criollo-type beans are the exception, since they never had much purple to lose.

From one pod to a bar

Once the pulp-covered beans come out of the pod, the farm's work begins. The International Cocoa Organization (ICCO) says pods are usually opened within seven to ten days of harvest, ideally with a blunt wooden tool so the beans are not cut. The beans are fermented for a few days and then dried until about 7.5 percent moisture is left. Only then do they travel to a chocolate maker, who roasts, cracks, winnows and grinds them. We walk through those later steps in what bean-to-bar means, step by step, and through fermentation in how cacao is fermented and dried.

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