All about cognac

Walnuts, mushrooms, old leather and the chemistry behind one of Cognac’s most mysterious characteristics.

There are a few words that seem almost compulsory when describing very old Cognac. Rancio is one of them.

Open a sufficiently old Grande Champagne, find some walnuts, mushrooms, leather or old furniture on the nose, and sooner or later somebody will mention rancio Charentais. Preferably with a suitably reverential expression.

And I understand why. Some of the most extraordinary Cognacs I’ve tasted have displayed precisely those characteristics. That combination of old wood, dried fruit, earthy notes, nuts and remarkable aromatic complexity can be fascinating.

But what exactly is rancio? Is it a particular aroma? A collection of aromas? A chemical reaction? A stage of maturation? Something that only appears after several decades in oak? And perhaps more importantly, are we sometimes using the word simply because the Cognac is old and expensive?

Let’s investigate.

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From XO and Grande Champagne to Lot 75, vintage Cognacs and brut de fût: how much can we really learn from a bottle?

Independent (and sometimes official) Scotch whisky labels can be remarkably informative. Distillation dates, cask numbers, wood types, outturns, bottling strengths… sometimes there is so much information that you almost need a magnifying glass.

Cognac labels can be a rather different experience.

One bottle proudly announces that it is an XO. Another says Hors d’Âge. A third gives us a precise vintage, while another simply says Lot 75. Some mention Grande Champagne, others Fine Champagne. One is bottled at 40%, another at 54%, and both may contain eaux-de-vie that have spent decades in oak.

And somehow we’re supposed to compare them.

The problem isn’t that Cognac labels tell us nothing. They can tell us quite a lot. It’s that what they guarantee, what they suggest and what we assume they mean are three different things.

So let’s decode them.

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