Today, Mount Etna is synonymous with Nerello (Mascalese and Cappuccio) and Carricante, but that wasn't always the case. In some isolated villages, like Maletto, extreme weather conditions and high altitudes (in this specific case, 1100mt above sea level) have made it difficult for these relatively newcomer varieties to ripen, so only the indigenous Granazzu (Grenache) and Grecanico Dorato grapes are grown there.
The terroir in Maletto is rather unique - naturally volcanic but also unusually dynamic - as the soil composition changes with every eruption. The volcanic ashes work almost as a natural fertilizer for the vines, making organic farming rather easy. Furthermore, since Maletto doesn't have wineries or large vineyards, the few scattered parcels Sonia ended up taking over were familial vineyards that had been farmed naturally for generations.
Typically, Etna isn't a terroir that gives plenty of structure; on the contrary, wines tend to be delicate and elegant, with a nice freshness that carries through. However, the grapes - and anything else planted on the terraces of Mount Etna, for that matter - show great intensity and character. This is due to the terroir, as already mentioned, but also thanks to the brutal thermal excursion between day and night. The production process is entirely manual and as low intervention as possible: vinifications are delicate and carried out with the utmost respect for the grapes, without the addition of any oenological products.