To what percentage of alcohol is the base wine fortified in Fino Sherry production?

In Fino Sherry production, the base wine is fortified to a strength of approximately 15% alcohol by volume (ABV). This level of fortification is essential to the style of Fino, as it allows the wine to develop its unique characteristics while promoting the growth of a protective layer of flor yeast. The flor yeast covers the surface of the wine, preventing oxidation and imparting fresh, bready, and nutty flavors typical of Fino Sherry.

Fortification at this level maintains the delicate balance of flavors and aromas, which is key to Fino's profile. It is crucial for the wine to remain below 16% ABV to ensure successful flor development during the aging process, which is a distinctive feature of Fino Sherry compared to other styles. The chosen fortification level also influences the maturation process in the solera system used for aging sherries.