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
Fortified wine such as sherry, the alcohol is added shortly before or after the end of the fermentation. In the case of some fortified wine styles (such as late harvest and botrytized wines), a naturally high level of sugar will inhibit the yeast. This causes fermentation to stop before the wine can become dry. Commandaria is made in Cyprus' unique AOC region north of Limassol from high altitude vines of Mavro and Xynisteri, sun dried and aged in oak barrels. Recent developments have produced different styles of Commandaria, some of which are not fortified. Madeira is a fortified wine made in the