The appellation of AOC (appellation d'origine contrôlée) for calvados authorizes double distillation for all calvados, but it is required for the calvados Pays d’Auge.Double distillation is carried out in a traditional alembic pot still, called either l'alambic à repasse or charentaisSingle continuous distillation in a column stillThe usual arguments for and against the two processes are that the former process gives the spirit complexity and renders it suitable for longer aging, whilst the latter process gives the calvados a fresh and clean apple flavour but with less complexity. In fact, a growing belief indicates a well-operated column still can produce as complex and "age-able" calvados as double distillation
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