The art of roasting cacao

When bags of raw cacao arrive at our Lab in Porto, the first thing we do is listen. Before any chocolate is made, we need to understand what each origin is telling us — its density, moisture, fat content, the aromatic compounds left behind by fermentation. Only then can we develop a roast profile: a custom curve of time against temperature, designed for that specific bean, from that specific farm.

Why we roast light

Cacao, like coffee, can be over-roasted. Push the temperature too far and the delicate compounds responsible for floral notes, fruit acidity, and origin character begin to break down. What remains is bitterness — intensity without nuance.

A dark roast doesn't make chocolate richer. It makes every origin taste the same.

By roasting lighter, we preserve what's already in the bean. It's also why two of our bars at 70% can taste completely different: same recipe, different origin, different roast profile. The percentage tells you the ratio of cacao to sugar — not what it tastes like.

The four stages of the roast

Drying

Residual moisture is gently removed before any roasting chemistry begins. Rush this and development becomes uneven.

Maillard reaction

Amino acids and sugars react, forming hundreds of aromatic compounds. This is where chocolate flavor is created — and where timing is most critical.

Development

The beans crack audibly as temperature peaks. The maker is tasting and adjusting — the difference between a great bar and a flat one can be just a few minutes here.

Finish & quench

Beans are rapidly cooled to stop the roast exactly where intended, locking in the flavors developed throughout.

The roast is the maker's signature

Give the same cacao to two different chocolate makers and you'll get two different chocolates. The roast is where a maker's philosophy becomes tangible — a creative act as much as a technical one. Every profile we develop here in Porto is a decision about what a particular cacao wants to become.

In our next post, we'll explore how the recipe — sugar type, ratios, and other choices — continues to shape the final flavor. But the roast is where it all begins.