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Concept
Fortified wine
Summary
Fortified wine is a wine to which a distilled spirit, usually brandy, has been added. In the course of some centuries, winemakers have developed many different styles of fortified wine, including port, sherry, madeira, Marsala, Commandaria wine, and the aromatised wine vermouth.
One reason for fortifying wine was to preserve it, since ethanol is also a natural antiseptic. Even though other preservation methods now exist, fortification continues to be used because the process can add distinct flavors to the finished product.
Although grape brandy is most commonly added to produce fortified wines, the additional alcohol may also be neutral spirit that has been made from grapes, grain, sugar beets or sugarcane. Regional appellation laws may dictate the types of spirit that are permitted for fortification. For example, in the U.S. only spirits made from the same fruit as the wine may be added.
The source of the additional alcohol and the method of its distillation can affect the flavour of the fortified wine. If neutral spirit is used, it is usually produced with a continuous still, rather than a pot still.
When added to wine before the fermentation process is complete, the alcohol in the distilled beverage kills the yeast and leaves residual sugar behind. The end result is a wine that is both sweeter and stronger, normally containing about 20% alcohol by volume (ABV).
During the fermentation process, yeast cells in the must continue to convert sugar into alcohol until the must reaches an alcohol level of 16–18%. At this level, the alcohol becomes toxic to the yeast and stalls its metabolism. If fermentation is allowed to run to completion, the resulting wine is (in most cases) low in sugar and is considered a dry wine. Adding alcohol earlier in the fermentation process results in a sweeter wine. For drier fortified wine styles, such as sherry, the alcohol is added shortly before or after the end of the fermentation.
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