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
Sicily region is known mainly for fortified Marsala wines. In recent decades the wine industry has improved, new winemakers are experimenting with less-known native varietals, and Sicilian wines have become better known. The best known local varietal is Nero d'Avola, named for a small town not far from Syracuse; the best wines made with these grapes come from Noto, a famous old city close to Avola. Other important native varietals are Nerello Mascalese used to make the Etna Rosso DOC wine, Frappato that is a component of the Cerasuolo di Vittoria DOCG wine, Moscato di Pantelleria (also known as "Zibibbo") used