Solera by the producers of sherry. In a Spanish sherry "solera", the vintner may transfer about a third of each barrel a year. A solera sherry has to be at least three years old when bottled. A quite similar process is called sostrera, used to produce fortified wines in the Mediterranean regions of France. In Sicily, where Marsala wine is made, the system is called "in perpetuum". Solera vinification is used in the making of Mavrodafni ("Black Laurel"), a fortified red dessert wine made in the Northern Peloponnese in Greece. Exceptional "Mavrodafni" vintages are released every 20 or 30 years: they
Marsala wine it would last on long ocean voyages, but now it is made that way because of its popularity in foreign markets. The most credible version of the introduction of Marsala fortified wine to a wider range of consumers is attributed to the English trader John Woodhouse. In 1773, Woodhouse landed at the port of Marsala and discovered the local wine produced in the region, which was aged in wooden casks and tasted similar to Spanish and Portuguese fortified wines then popular in England. Fortified Marsala was, and is, made using a process called "in perpetuum", which is similar to the