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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